The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Jesus Inarrea - One of the best experts on this subject based on the ideXlab platform.
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polarization immunity of Magnetoresistivity response under microwave excitation
Physical Review B, 2007Co-Authors: Jesus Inarrea, Gloria PlateroAbstract:We analyze theoretically the dependence of the longitudinal Magnetoresistivity response of microwave irradiated two-dimensional electron systems on the microwave polarization. Both linear and circular polarizations are considered. Recent experiments show that resistivity oscillations and zero resistance states are unaffected by changing the polarization of the microwave field. We propose a plausible explanation for the experimentally observed Magnetoresistivity polarization immunity.
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hall Magnetoresistivity response under microwave excitation revisited
Applied Physics Letters, 2007Co-Authors: Jesus InarreaAbstract:The authors theoretically analyzed the microwave-induced modification of the Hall Magnetoresistivity in high mobility two-dimensional electron systems. These systems present diagonal Magnetoresistivity oscillations and zero-resistance states when subjected to microwave radiation. The most surprising modification of the Hall Magnetoresistivity is a periodic reduction which correlates with a periodic increase in the diagonal resistivity. The authors present a model that explains the experimental results considering that radiation affects directly only the diagonal resistivity and that the observed Hall resistivity changes come from the tensor relationship between them.
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Hall Magnetoresistivity response under Microwave excitation revisited
Applied Physics Letters, 2007Co-Authors: Jesus InarreaAbstract:We theoretically analyzed the microwave-induced modification of the Hall Magnetoresistivity in high mobility two-dimensional electron systems. These systems present diagonal Magnetoresistivity oscillations and zero-resistance states when are subjected to microwave radiation. The most surprising modification of the Hall Magnetoresistivity is a periodic reduction which correlates with a periodic increase in the diagonal resistivity. We present a model that explains the experimental results considering that radiation affects directly only the diagonal resistivity and the observed Hall resistivity changes are coming from the tensor relationship between both of them.
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Magnetoresistivity modulated response in bichromatic microwave irradiated two dimensional electron systems
Applied Physics Letters, 2006Co-Authors: Jesus Inarrea, Gloria PlateroAbstract:The authors analyze the effect of bichromatic microwave irradiation on the Magnetoresistivity of a two dimensional electron system. The authors follow the model of microwave driven Larmor orbits in a regime where two different microwave lights with different frequencies are illuminating the sample (w1 and w2). The authors’ calculated results demonstrate that now the electronic orbit centers are driven by the superposition of two harmonic oscillatory movements with the frequencies of the microwave sources. As a result the Magnetoresistivity response presents modulated pulses in the amplitude with a frequency of (w1−w2)∕2, whereas the main response oscillates with (w1+w2)∕2.
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Magnetoresistivity modulated response in bichromatic microwave irradiated two dimensional electron systems
arXiv: Mesoscale and Nanoscale Physics, 2006Co-Authors: Jesus Inarrea, Gloria PlateroAbstract:We analyze the effect of bichromatic microwave irradiation on the Magnetoresistivity of a two dimensional electron system. We follow the model of microwave driven Larmor orbits in a regime where two different microwave lights with different frequencies are illuminating the sample ($w_{1}$ and $w_{2}$). Our calculated results demonstrate that now the electronic orbit centers are driven by the superposition of two harmonic oscillatory movements with the frequencies of the microwave sources. As a result the magnetoresisitivity response presents modulated pulses in the amplitude with a frequency of $\frac{w_{1}-w_{2}}{2}$, whereas the main response oscillates with $\frac{w_{1}+w_{2}}{2}$.
M. Putti - One of the best experts on this subject based on the ideXlab platform.
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Effect of the four-sheet Fermi surface on Magnetoresistivity of MgB2
The European Physical Journal B, 2006Co-Authors: I. Pallecchi, M. Monni, C. Ferdeghini, V. Ferrando, M. Putti, C. Tarantini, E. Galleani D'aglianoAbstract:Recent experimental data of anisotropic Magnetoresistivity measured in MgB2 films have shown an intriguing behaviour: the angular dependence of Magnetoresistivity changes dramatically with temperature and disorder. In order to explain such phenomenology, in this work, we extend our previous analyses on multiband transverse Magnetoresistivity in magnesium diboride, by calculating its analytic expression, assuming a constant anisotropic Fermi surface mass tensor. The calculation is done for arbitrary orientation of the magnetic field with respect to the crystalline axes and for the current density either perpendicular or parallel to the magnetic field. This approach allows to extract quite univocally the values of the scattering times in the σ- and π-bands by fitting experimental data with a simple analytic expression. We also extend the analysis to the Magnetoresistivity of polycrystalline samples, with an arbitrary angle between the current density and the magnetic field, taking into account the anisotropy of each randomly oriented grain. Thereby, we propose Magnetoresistivity as a very powerful characterization tool to explore the effect of disorder by irradiation or selective doping as well as of phonon scattering in each one of the two types of bands, in single crystals and polycrystalline samples, which is a crucial issue in the study of magnesium diboride.
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Effect of the four-sheet Fermi surface on Magnetoresistivity of MgB_2
The European Physical Journal B - Condensed Matter and Complex Systems, 2006Co-Authors: I. Pallecchi, M. Monni, C. Ferdeghini, V. Ferrando, M. Putti, C. Tarantini, E. Galleani D'aglianoAbstract:Recent experimental data of anisotropic Magnetoresistivity measured in MgB_2 films have shown an intriguing behaviour: the angular dependence of Magnetoresistivity changes dramatically with temperature and disorder. In order to explain such phenomenology, in this work, we extend our previous analyses on multiband transverse Magnetoresistivity in magnesium diboride, by calculating its analytic expression, assuming a constant anisotropic Fermi surface mass tensor. The calculation is done for arbitrary orientation of the magnetic field with respect to the crystalline axes and for the current density either perpendicular or parallel to the magnetic field. This approach allows to extract quite univocally the values of the scattering times in the σ- and π-bands by fitting experimental data with a simple analytic expression. We also extend the analysis to the Magnetoresistivity of polycrystalline samples, with an arbitrary angle between the current density and the magnetic field, taking into account the anisotropy of each randomly oriented grain. Thereby, we propose Magnetoresistivity as a very powerful characterization tool to explore the effect of disorder by irradiation or selective doping as well as of phonon scattering in each one of the two types of bands, in single crystals and polycrystalline samples, which is a crucial issue in the study of magnesium diboride.
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Magnetoresistivity of DyNi2B2C thin film
Intermetallics, 1999Co-Authors: C. Ferdeghini, Fabio Canepa, M.r. Cimberle, G. Grassano, S. Gariglio, Daniele Marré, F. Napoli, M. PuttiAbstract:Abstract We present high-resolution resistivity and Magnetoresistivity measurements on a DyNi 2 B 2 C thin film obtained by laser ablation. The measurements are interpreted in the framework of the theory developed by Yamada and Takada (YT) in the early 1970s (Yamada H., Takada S. Prog Theor Phys 1973;49:1401) for the Magnetoresistivity of the antiferromagnetic materials and permit identification of the magnetic field H c2 that destroys the magnetic ordering. So, we obtain a H–T phase diagram where the antiferromagnetic and paramagnetic states are unambiguously determined and that we compare with data in the literature. Finally, in the paramagnetic state we have found a linear dependence between Magnetoresistivity and the square of the magnetization.
M. Grazia Francesconi - One of the best experts on this subject based on the ideXlab platform.
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Increase in Magnetoresistivity in Ba2CoS3via Zn2+/Co2+ substitution
Chemical Communications, 2009Co-Authors: Mark Harrison, Vincent Hardy, Antoine Maignan, M. Grazia FrancesconiAbstract:We report an increase of negative Magnetoresistivity from 1.7% to 9% in the Ba2Co0.5Zn0.5S3 series (0 ≤x≤ 0.5), derived from Zn2+/Co2+ substitution in Ba2CoS3; Zn2+ substitution destroys the one-dimensional antiferromagnetic ordering typical of Ba2CoS3, in favour of a paramagnetic behaviour, and considerably increases the value of the resistivity, and to the best of our knowledge Ba2Co0.5Zn0.5S3 shows the most negative Magnetoresistivity among the one-dimensional sulfides (MR ∼ 9%).
C. Ferdeghini - One of the best experts on this subject based on the ideXlab platform.
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Effect of the four-sheet Fermi surface on Magnetoresistivity of MgB2
The European Physical Journal B, 2006Co-Authors: I. Pallecchi, M. Monni, C. Ferdeghini, V. Ferrando, M. Putti, C. Tarantini, E. Galleani D'aglianoAbstract:Recent experimental data of anisotropic Magnetoresistivity measured in MgB2 films have shown an intriguing behaviour: the angular dependence of Magnetoresistivity changes dramatically with temperature and disorder. In order to explain such phenomenology, in this work, we extend our previous analyses on multiband transverse Magnetoresistivity in magnesium diboride, by calculating its analytic expression, assuming a constant anisotropic Fermi surface mass tensor. The calculation is done for arbitrary orientation of the magnetic field with respect to the crystalline axes and for the current density either perpendicular or parallel to the magnetic field. This approach allows to extract quite univocally the values of the scattering times in the σ- and π-bands by fitting experimental data with a simple analytic expression. We also extend the analysis to the Magnetoresistivity of polycrystalline samples, with an arbitrary angle between the current density and the magnetic field, taking into account the anisotropy of each randomly oriented grain. Thereby, we propose Magnetoresistivity as a very powerful characterization tool to explore the effect of disorder by irradiation or selective doping as well as of phonon scattering in each one of the two types of bands, in single crystals and polycrystalline samples, which is a crucial issue in the study of magnesium diboride.
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Effect of the four-sheet Fermi surface on Magnetoresistivity of MgB_2
The European Physical Journal B - Condensed Matter and Complex Systems, 2006Co-Authors: I. Pallecchi, M. Monni, C. Ferdeghini, V. Ferrando, M. Putti, C. Tarantini, E. Galleani D'aglianoAbstract:Recent experimental data of anisotropic Magnetoresistivity measured in MgB_2 films have shown an intriguing behaviour: the angular dependence of Magnetoresistivity changes dramatically with temperature and disorder. In order to explain such phenomenology, in this work, we extend our previous analyses on multiband transverse Magnetoresistivity in magnesium diboride, by calculating its analytic expression, assuming a constant anisotropic Fermi surface mass tensor. The calculation is done for arbitrary orientation of the magnetic field with respect to the crystalline axes and for the current density either perpendicular or parallel to the magnetic field. This approach allows to extract quite univocally the values of the scattering times in the σ- and π-bands by fitting experimental data with a simple analytic expression. We also extend the analysis to the Magnetoresistivity of polycrystalline samples, with an arbitrary angle between the current density and the magnetic field, taking into account the anisotropy of each randomly oriented grain. Thereby, we propose Magnetoresistivity as a very powerful characterization tool to explore the effect of disorder by irradiation or selective doping as well as of phonon scattering in each one of the two types of bands, in single crystals and polycrystalline samples, which is a crucial issue in the study of magnesium diboride.
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Magnetoresistivity of DyNi2B2C thin film
Intermetallics, 1999Co-Authors: C. Ferdeghini, Fabio Canepa, M.r. Cimberle, G. Grassano, S. Gariglio, Daniele Marré, F. Napoli, M. PuttiAbstract:Abstract We present high-resolution resistivity and Magnetoresistivity measurements on a DyNi 2 B 2 C thin film obtained by laser ablation. The measurements are interpreted in the framework of the theory developed by Yamada and Takada (YT) in the early 1970s (Yamada H., Takada S. Prog Theor Phys 1973;49:1401) for the Magnetoresistivity of the antiferromagnetic materials and permit identification of the magnetic field H c2 that destroys the magnetic ordering. So, we obtain a H–T phase diagram where the antiferromagnetic and paramagnetic states are unambiguously determined and that we compare with data in the literature. Finally, in the paramagnetic state we have found a linear dependence between Magnetoresistivity and the square of the magnetization.
S.n Kaul - One of the best experts on this subject based on the ideXlab platform.
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suppression of spin fluctuations by magnetic field in ni3al as evidenced from Magnetoresistivity
Journal of Magnetism and Magnetic Materials, 2004Co-Authors: Annie B D Santhoshini, S.n KaulAbstract:Abstract The suppression of spin waves and spin fluctuations with magnetic field in Ni 3 Al has been, for the first time, quantified through the field dependence of their contributions to resistivity and Magnetoresistivity.
