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Rimma Lyubovskaya - One of the best experts on this subject based on the ideXlab platform.
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Quantum oscillations in the linear chain of coupled orbits: the organic metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2))
EPL - Europhysics Letters, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, Rimma Lyubovskaya, L Drigo, F Duc, Elena I. Zhilayeva, Gena Shilov, Enric CanadellAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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quantum oscillations in the linear chain of coupled orbits the organic metal with two cation layers θ et 4cobr4 c6h4cl2
EPL, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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Quantum oscillations in the linear chain of coupled orbits: The organic metal with two cation layers θ-(ET)
EPS SIF EDP Sciences and IOP Publishing, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (α) and magnetic-breakdown–induced (β and 2β−α) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the “forbidden orbit” β−α amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2α and the magnetic breakdown orbit β+α, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal θ-(ET)4CoBr4(C6H4Cl2)
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Magnetic oscillations in the 2D network of compensated coupled orbits of the organic metal (BEDT-TTF)
EDP Sciences, 2003Co-Authors: David Vignolles, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, M. Nardone, E. Haanappel, Rimma LyubovskayaAbstract:Interlayer magnetoresistance and magnetisation of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2 have been investigated in pulsed magnetic fields extending up to 60 T and 33 T, respectively. About fifteen fundamental frequencies, composed of linear combinations of only three basic frequencies, are observed in the oscillatory spectra of the magnetoresistance. The dependencies of the oscillation amplitude on the temperature and on the magnitude and orientation of the magnetic field are analyzed in the framework of the conventional two-dimensional Lifshitz-Kosevitch (LK) model. This model is implemented by damping factors which accounts for the magnetic breakthrough occurring between electron and hole orbits yielding conventional Shubnikov-de Haas closed orbits (model of Falicov and Stachowiak) and quantum interferometers. In particular, a quantum interferometer enclosing an area equal to the first Brillouin zone area is evidenced. The LK model consistently accounts for the temperature and magnetic field dependence of the oscillation amplitude of this interferometer. On the contrary, although this model formally accounts for almost all of the observed oscillatory components, it fails to give consistent quantitative data in most other cases
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Magnetic oscillations in the 2D network of compensated coupled orbits of the organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2
The European Physical Journal B - Condensed Matter, 2003Co-Authors: David Vignolles, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, M. Nardone, E. Haanappel, Rimma LyubovskayaAbstract:Interlayer magnetoresistance and magnetisation of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2 have been investigated in pulsed magnetic fields extending up to 60 T and 33 T, respectively. About fifteen fundamental frequencies, composed of linear combinations of only three basic frequencies, are observed in the oscillatory spectra of the magnetoresistance. The dependencies of the oscillation amplitude on the temperature and on the magnitude and orientation of the magnetic field are analyzed in the framework of the conventional two-dimensional Lifshitz-Kosevitch (LK) model. This model is implemented by damping factors which accounts for the magnetic breakthrough occurring between electron and hole orbits yielding conventional Shubnikov-de Haas closed orbits (model of Falicov and Stachowiak) and quantum interferometers. In particular, a quantum interferometer enclosing an area equal to the first Brillouin zone area is evidenced. The LK model consistently accounts for the temperature and magnetic field dependence of the oscillation amplitude of this interferometer. On the contrary, although this model formally accounts for almost all of the observed oscillatory components, it fails to give consistent quantitative data in most other cases.
A. Audouard - One of the best experts on this subject based on the ideXlab platform.
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Quantum oscillations in the linear chain of coupled orbits: the organic metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2))
EPL - Europhysics Letters, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, Rimma Lyubovskaya, L Drigo, F Duc, Elena I. Zhilayeva, Gena Shilov, Enric CanadellAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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quantum oscillations in the linear chain of coupled orbits the organic metal with two cation layers θ et 4cobr4 c6h4cl2
EPL, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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Quantum oscillations in the linear chain of coupled orbits: The organic metal with two cation layers θ-(ET)
EPS SIF EDP Sciences and IOP Publishing, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (α) and magnetic-breakdown–induced (β and 2β−α) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the “forbidden orbit” β−α amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2α and the magnetic breakdown orbit β+α, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal θ-(ET)4CoBr4(C6H4Cl2)
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Frequency combinations in the magnetoresistance oscillations spectrum of a linear chain of coupled orbits with a high scattering rate
EDP Sciences, 2007Co-Authors: David Vignolles, A. Audouard, Enric Canadell, V. N. Laukhin, J. Béard, N. G. Spitsina, E. B. YagubskiiAbstract:The oscillatory magnetoresistance spectrum of the organic metal (BEDO)5Ni(CN)4. 3C2H4(OH)2 has been studied up to 50 T, in the temperature range from 1.5 K to 4.2 K. In high magnetic field, its Fermi surface corresponds to a linear chain of quasi-two-dimensional orbits coupled by magnetic breakdown (MB). The scattering rate consistently deduced from the data relevant to the basic α and the MB-induced β orbits is very large which points to a significant reduction of the chemical potential oscillation. Despite of this feature, the oscillations spectrum exhibits many frequency combinations. Their effective masses and (or) Dingle temperature are not in agreement with either the predictions of the quantum interference model or the semiclassical model of Falicov and Stachowiak
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Frequency combinations in the magnetoresistance oscillations spectrum of a linear chain of coupled orbits with a high scattering rate
2007Co-Authors: David Vignolles, A. Audouard, Enric Canadell, V. N. Laukhin, J. Béard, N. G. Spitsina, E. B. YagubskiiAbstract:The oscillatory magnetoresistance spectrum of the organic metal (BEDO)$_5$Ni(CN)$_4\cdot$3C$_2$H$_4$(OH)$_2$ has been studied up to 50 T, in the temperature range from 1.5 K to 4.2 K. In high magnetic field, its Fermi surface corresponds to a linear chain of quasi-two-dimensional orbits coupled by magnetic breakdown (MB). The scattering rate consistently deduced from the data relevant to the basic $\alpha$ and the MB-induced $\beta$ orbits is very large which points to a significant reduction of the chemical potential oscillation. Despite of this feature, the oscillations spectrum exhibits many frequency combinations. Their effective masses and (or) Dingle temperature are not in agreement with either the predictions of the quantum interference model or the semiclassical model of Falicov and Stachowiak.
Ben O'shaughnessy - One of the best experts on this subject based on the ideXlab platform.
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Tension and Constriction of the Cytokinetic Contractile Ring Depend on Anchoring of Ring Components to the Plasma Membrane
Biophysical Journal, 2015Co-Authors: Shuyuan Wang, Ben O'shaughnessyAbstract:Cytokinesis involves constriction of a tension-producing actomyosin contractile ring that divides the cell. How the ring generates tension remains intensely debated. A sliding filament mechanism where myosin pulls actin filaments was proposed long ago, similar to striated muscle which has sarcomeric organization. However, contractile rings are far more disordered, and it is thought that random actomyosin bundles cannot generate tension. Recently, we presented evidence that tension originates in anchoring of actin filaments to the membrane (Stachowiak et al., Dev. Cell, 2014).Here we mathematically modeled the constricting ring to explain a recent study of permeabilized fission yeast protoplast that examined ring constriction in controlled environments (Mishra et al, Nature Cell Biol., 2013). The experiments directly tested the role of ring anchoring: following ATP addition, rings partially detached from the membrane and constricted at a constant rate independent of initial length.We extended our molecularly explicit model (Stachowiak et al., Dev. Cell, 2014) to explain these findings and to test the role of anchoring. The model assumes barbed end actin filament anchoring. In agreement with Mishra et al., simulated detached ring segments had almost zero tension and shortened at a rate somewhat less than twice the myosin-II load-free velocity. Our analysis explains why the shortening rate is independent of ring length: detached regions did not contract, but shortened by being reeled in at their end points, each end point contributing v0myo. Unanchored ring segments have zero tension but nevertheless shorten because they are connected to anchored segments with tension. Completely detached simulated rings did not constrict. Simulations reproduced other observations by Mishra et al, including the dependence of constriction on myosin-II but not on actin turnover, and retarded constriction by increased actin crosslinking.
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Measurements and Simulations of the Fission Yeast Cytokinetic Ring Tension during Constriction
Biophysical Journal, 2015Co-Authors: Harvey F. Chin, Erdem Karatekin, Thomas D. Pollard, Ben O'shaughnessyAbstract:Cytokinesis in animals and fungi requires the assembly and constriction of an actomyosin contractile ring at the site of cell division. However, the ring tension_the ring's principal mechanical property_has rarely been measured. Consequently, it has not been possible to relate the organization of the ring to its principal function. To address this, we recently developed a method to measure the cytokinetic ring tension in fission yeast for the first time (Stachowiak et al., Dev. Cell, 2014). We used micropipette aspiration on yeast protoplasts (whose cell walls have been enzymatically digested) to measure the membrane tension and imaged the geometry of the membrane furrow induced by the tense ring by fluorescence microscopy in order to deduce the ring tension from a force balance at the furrow. The availability of a method to measure cytokinetic ring tension has opened the door to observing the effect of mutations and drug treatments on ring tension that were previously invisible. Here, we develop the ring tension measurement to track ring tension in real time throughout the full course of constriction, and we measured tension in fission yeast mutants and wild type cells following drug treatments where the activity and dynamics of myosin or actin are compromised. We coordinated these measurements with a mathematical model of the constricting ring to test the mechanism of tension production and constriction. Insights into this mechanism that have resulted highlight the sensitivity to actin filament length and polymerization and the role of myosin activity in maintenance of steady state tension.
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Actin Disassembly is Mechanically Regulated in Spontaneously Fracturing Stress Fibers
Biophysical Journal, 2011Co-Authors: Matthew R. Stachowiak, Mark A. Smith, Elizabeth Blankman, Laura Luettjohann, Hayri E. Balcioglu, Ben O'shaughnessyAbstract:Stress fibers are contractile bundles of actin, myosin and other components which mechanically interact with the extracellular matrix and maintain the cell's structural integrity. As part of the cytoskeleton they must be able to rapidly remodel in response to dynamic stimuli, but detailed mechanisms are not established. Here we use mathematical modeling and quantitative image analysis of cells expressing tagged stress fiber components to study stress fiber remodeling. We observed occasional acute elongation of stress fibers followed either by repair (82% of the time) or spontaneous fracturing followed by rapid recoil over ∼25 s (18%). Fractured stress fibers shortened by ∼80% total regardless of their initial length, suggesting significant attachments to other cytoskeletal elements were absent. We discovered that fiber shortening is accompanied by substantial actin disassembly with a ∼30 s delay. The disassembly processes shed ∼40% of the actin initially present. Thus, the fiber actin density increases during recoil, peaks, and then decays to twice its initial value. To quantitatively explain this behavior we extended an earlier mathematical model of stress fibers to spontaneous fracture and recoil [Stachowiak and O'Shaughnessy, New J. Phys., v10, p025002 (2008)]. The model predicts that, following breakage, fiber shortening due to myosin contractile force increases actin density which in turn augments actin-actin compressive elastic stresses. These stresses promote actin depolymerization, thus allowing the fiber to remodel its actin. Model predictions agree quantitatively with experimental data. The measured 30 s delay is the time for actin density during contraction to reach the threshold to trigger depolymerization-promoting stresses. These results demonstrate that remodeling of cytoskeletal structures can be mechanically regulated by coupling between shape, elastic stress and component turnover rates.
R.b. Lyubovskii - One of the best experts on this subject based on the ideXlab platform.
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Quantum oscillations in the linear chain of coupled orbits: the organic metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2))
EPL - Europhysics Letters, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, Rimma Lyubovskaya, L Drigo, F Duc, Elena I. Zhilayeva, Gena Shilov, Enric CanadellAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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quantum oscillations in the linear chain of coupled orbits the organic metal with two cation layers θ et 4cobr4 c6h4cl2
EPL, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (alpha) and magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the 'forbidden orbit' beta - alpha amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).
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Quantum oscillations in the linear chain of coupled orbits: The organic metal with two cation layers θ-(ET)
EPS SIF EDP Sciences and IOP Publishing, 2012Co-Authors: A. Audouard, R.b. Lyubovskii, Jean-yves Fortin, David Vignolles, L Drigo, F Duc, G V Shilov, G Ballon, E I Zhilyaeva, Rimma LyubovskayaAbstract:Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived systematically taking into account the chemical potential oscillations in magnetic field. Although corrective terms are observed, basic (α) and magnetic-breakdown–induced (β and 2β−α) orbits can be accounted for by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in the explored field and temperature ranges. In contrast, the “forbidden orbit” β−α amplitude is described by a non-LK equation involving a product of two classical orbit amplitudes. Furthermore, strongly non-monotonic field and temperature dependence may be observed for the second harmonics of basic frequencies such as 2α and the magnetic breakdown orbit β+α, depending on the value of the spin damping factors. These features are in agreement with the dHvA oscillation spectra of the strongly 2D organic metal θ-(ET)4CoBr4(C6H4Cl2)
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Magnetic oscillations in the 2D network of compensated coupled orbits of the organic metal (BEDT-TTF)
EDP Sciences, 2003Co-Authors: David Vignolles, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, M. Nardone, E. Haanappel, Rimma LyubovskayaAbstract:Interlayer magnetoresistance and magnetisation of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2 have been investigated in pulsed magnetic fields extending up to 60 T and 33 T, respectively. About fifteen fundamental frequencies, composed of linear combinations of only three basic frequencies, are observed in the oscillatory spectra of the magnetoresistance. The dependencies of the oscillation amplitude on the temperature and on the magnitude and orientation of the magnetic field are analyzed in the framework of the conventional two-dimensional Lifshitz-Kosevitch (LK) model. This model is implemented by damping factors which accounts for the magnetic breakthrough occurring between electron and hole orbits yielding conventional Shubnikov-de Haas closed orbits (model of Falicov and Stachowiak) and quantum interferometers. In particular, a quantum interferometer enclosing an area equal to the first Brillouin zone area is evidenced. The LK model consistently accounts for the temperature and magnetic field dependence of the oscillation amplitude of this interferometer. On the contrary, although this model formally accounts for almost all of the observed oscillatory components, it fails to give consistent quantitative data in most other cases
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Magnetic oscillations in the 2D network of compensated coupled orbits of the organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2
The European Physical Journal B - Condensed Matter, 2003Co-Authors: David Vignolles, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, M. Nardone, E. Haanappel, Rimma LyubovskayaAbstract:Interlayer magnetoresistance and magnetisation of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Br)2 have been investigated in pulsed magnetic fields extending up to 60 T and 33 T, respectively. About fifteen fundamental frequencies, composed of linear combinations of only three basic frequencies, are observed in the oscillatory spectra of the magnetoresistance. The dependencies of the oscillation amplitude on the temperature and on the magnitude and orientation of the magnetic field are analyzed in the framework of the conventional two-dimensional Lifshitz-Kosevitch (LK) model. This model is implemented by damping factors which accounts for the magnetic breakthrough occurring between electron and hole orbits yielding conventional Shubnikov-de Haas closed orbits (model of Falicov and Stachowiak) and quantum interferometers. In particular, a quantum interferometer enclosing an area equal to the first Brillouin zone area is evidenced. The LK model consistently accounts for the temperature and magnetic field dependence of the oscillation amplitude of this interferometer. On the contrary, although this model formally accounts for almost all of the observed oscillatory components, it fails to give consistent quantitative data in most other cases.
Cyril Proust - One of the best experts on this subject based on the ideXlab platform.
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Competing types of quantum oscillations in the two-dimensional organic conductor (BEDT-TTF)8Hg4Cl12(C6H5Cl)2
Physical Review B, 2002Co-Authors: Cyril Proust, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, Rimma LyubovskayaAbstract:The interlayer magnetoconductance of the quasi-two-dimensional organic metal $(\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F}{)}_{8}{\mathrm{Hg}}_{4}{\mathrm{Cl}}_{12}({\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{Cl}{)}_{2}$ has been investigated in pulsed magnetic fields extending up to 36 T and in the temperature range from 1.6 to 15 K. A complex oscillatory spectrum, built on linear combinations of three basic frequencies only, is observed. These basic frequencies arise from the compensated closed hole and electron orbits and from the two orbits located in between. The field and temperature dependences of the amplitude of the various oscillation series are studied within the framework of the coupled-orbits model of Falicov and Stachowiak. This analysis reveals that these series result from the contribution of either the conventional Shubnikov\char21{}de Haas effect or quantum interference (QI), both of them being induced by magnetic breakthrough. Nevertheless, discrepancies between experimental and calculated parameters indicate that these phenomena alone cannot account for all of the data. Due to its low effective mass, one of the QI oscillation series\char22{}which corresponds to the whole first Brillouin zone area\char22{}is clearly observed up to 13 K.
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Competing types of quantum oscillations in the 2D organic conductor (BEDT-TTF)8Hg4Cl12(C6H5Cl)2
Physical Review B: Condensed Matter and Materials Physics, 2002Co-Authors: Cyril Proust, R.b. Lyubovskii, A. Audouard, L. Brossard, S. Pesotskii, Rimma LyubovskayaAbstract:Interlayer magnetoconductance of the quasi-two dimensional organic metal (BEDT-TTF)8Hg4Cl12(C6H5Cl)2 has been investigated in pulsed magnetic fields extending up to 36 T and in the temperature range from 1.6 to 15 K. A complex oscillatory spectrum, built on linear combinations of three basic frequencies only is observed. These basic frequencies arise from the compensated closed hole and electron orbits and from the two orbits located in between. The field and temperature dependencies of the amplitude of the various oscillation series are studied within the framework of the coupled orbits model of Falicov and Stachowiak. This analysis reveals that these series result from the contribution of either conventional Shubnikov-de Haas effect (SdH) or quantum interference (QI), both of them being induced by magnetic breakthrough. Nevertheless, discrepancies between experimental and calculated parameters indicate that these phenomena alone cannot account for all of the data. Due to its low effective mass, one of the QI oscillation series - which corresponds to the whole first Brillouin zone area - is clearly observed up to 13 K.