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Toshiro Sakakibara - One of the best experts on this subject based on the ideXlab platform.
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Field Angle resolved landscape of non fermi liquid behavior in the quasi kagome kondo lattice cerhsn
Journal of the Physical Society of Japan, 2021Co-Authors: Shunichiro Kittaka, Yohei Kono, S Tsuda, Toshiro Takabatake, Toshiro SakakibaraAbstract:We have employed a magnetic Field Angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn...
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orientation of point nodes and nonunitary triplet pairing tuned by the easy axis magnetization in ute 2
Physical Review Research, 2020Co-Authors: Shunichiro Kittaka, Toshiro Sakakibara, Yusei Shimizu, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Dai Aoki, Kazushige MachidaAbstract:This paper studies the Field-Angle dependencies of high-quality single crystal of UTe${}_{2}$ in standard and superconductivity states. The results suggest the presence of point nodes along the $a$ axis in the superconducting gap.
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Field Angle resolved landscape of non fermi liquid behavior in the quasi kagome kondo lattice cerhsn
arXiv: Strongly Correlated Electrons, 2019Co-Authors: Shunichiro Kittaka, Yohei Kono, S Tsuda, Toshiro Takabatake, Toshiro SakakibaraAbstract:We have employed a magnetic Field Angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn, which is considered to exhibit zero-Field quantum criticality driven by geometrical frustration. By constructing the Field-Angle-resolved landscape of the entropy, we unexpectedly revealed that the non-Fermi-liquid nature survives up to a metamagnetic crossover Field of roughly 3 T in the very narrow Field-orientation range, close to the direction parallel to the quasi-kagome plane. We propose that spin fluctuations along the hexagonal $c$ axis are the dominant driving force for the non-Fermi-liquid behavior because it is strongly suppressed by a magnetic-Field component along the $c$ axis. The multidimensional entropy landscape, which directly reflects the degeneracy of ground states, opens a new route for uncovering the nature of exotic phases in anisotropic systems.
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searching for gap zeros in sr2ruo4 via Field Angle dependent specific heat measurement
Journal of the Physical Society of Japan, 2018Co-Authors: Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, D A Sokolov, A P Mackenzie, Koki IrieAbstract:The gap structure of Sr2RuO4, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specific heat on magnetic fie...
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searching for gap zeros in sr2ruo4 via Field Angle dependent specific heat measurement
arXiv: Superconductivity, 2018Co-Authors: Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, D A Sokolov, A P Mackenzie, Koki IrieAbstract:The gap structure of Sr$_2$RuO$_4$, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specific heat on magnetic Field Angles at temperatures as low as 0.06 K ($\sim 0.04T_{\rm c}$). Except near $H_{\rm c2}$, its fourfold specific-heat oscillation under an in-plane rotating magnetic Field is unlikely to change its sign down to the lowest temperature of 0.06 K. This feature is qualitatively different from nodal quasiparticle excitations of a quasi-two-dimensional superconductor possessing vertical lines of gap minima. The overall specific-heat behavior of Sr$_2$RuO$_4$ can be explained by Doppler-shifted quasiparticles around horizontal line nodes on the Fermi surface, whose in-plane Fermi velocity is highly anisotropic, along with the occurrence of the Pauli-paramagnetic effect. These findings, in particular, the presence of horizontal line nodes in the gap, call for a reconsideration of the order parameter of Sr$_2$RuO$_4$.
Kazushige Machida - One of the best experts on this subject based on the ideXlab platform.
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orientation of point nodes and nonunitary triplet pairing tuned by the easy axis magnetization in ute 2
Physical Review Research, 2020Co-Authors: Shunichiro Kittaka, Toshiro Sakakibara, Yusei Shimizu, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Dai Aoki, Kazushige MachidaAbstract:This paper studies the Field-Angle dependencies of high-quality single crystal of UTe${}_{2}$ in standard and superconductivity states. The results suggest the presence of point nodes along the $a$ axis in the superconducting gap.
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vortex state and Field Angle resolved specific heat oscillation for h ab in d wave superconductors
Journal of the Physical Society of Japan, 2010Co-Authors: Masayuki Hiragi, Kenta M Suzuki, Masanori Ichioka, Kazushige MachidaAbstract:When magnetic Field is applied parallel to the a b -plane in d x 2 - y 2 -wave superconductors, the transition of a stable vortex lattice structure, the spatial structure of local density of states, and the specific heat oscillation induced by rotation of the magnetic Field orientation are investigated by quantitative calculations based on the self-consistent Eilenberger theory. We estimate how the vortex state changes depending on the relative Angle between the node direction of the superconducting gap and magnetic Field orientation. To reproduce the sign change of specific heat oscillation observed in CeCoIn 5 , our study is perfomed by including a strong paramagnetic effect. The quantitative theoretical calculations give decisive information to analyze the experimental data on the Field-Angle dependence, and establish the Angle-resolved specific heat experiment as a spectroscopic means to identify the node position of the superconducting gap.
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vortex state and Field Angle resolved specific heat oscillation for h ab in d wave superconductors
arXiv: Superconductivity, 2010Co-Authors: Masayuki Hiragi, Kenta M Suzuki, Masanori Ichioka, Kazushige MachidaAbstract:When magnetic Field is applied parallel to the ab plane in d_{x^2-y^2}-wave superconductors, the transition of stable vortex lattice structure, spatial structure of local density of states, and specific heat oscillation by rotation of magnetic Field orientation are investigated by quantitative calculations based on the selfconsistent Eilenberger theory. We estimate how the vortex state changes depending on the relative Angle between the node-direction of the superconducting gap and magnetic Field orientation. To reproduce the sign-change of specific heat oscillation observed in CeCoIn_5, our study is done by including strong paramagnetic effect. The quantitative theoretical calculations give decisive information to analyze the experimental data on the Field-Angle dependence, and establish the Angle-resolved specific heat experiment as a spectroscopic means to identify the node-position of the superconducting gap.
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sign reversal of Field Angle resolved heat capacity oscillations in a heavy fermion superconductor cecoin5 and dx2 y2 pairing symmetry
Physical Review Letters, 2010Co-Authors: K An, Toshiro Sakakibara, Masanori Ichioka, R Settai, Yoshichika Onuki, M Hiragi, Kazushige MachidaAbstract:: To identify the superconducting gap symmetry in CeCoIn5 (T{c}=2.3 K), we measured the Angle-resolved specific heat (C{phi}) in a Field rotated around the c axis down to a very low temperature, 0.05T{c}, and made detailed theoretical calculations. In a Field of 1 T, a sign reversal of the fourfold angular oscillation in C{phi} was observed at T approximately 0.1T{c} upon entering a quasiclassical regime where the maximum of C{phi} corresponds to the antinodal direction, coinciding with the Angle-resolved density of states (ADOS) calculation. The C{phi} behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude d{x{2}-y{2}} symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/T{c} approximately 0.1 and 1.5 T (0.13H{c2}).
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sign reversal of Field Angle resolved heat capacity oscillations in a heavy fermion superconductor cecoin 5 and d x 2 y 2 pairing symmetry
Physical Review Letters, 2010Co-Authors: Toshiro Sakakibara, Masayuki Hiragi, Masanori Ichioka, R Settai, Yoshichika Onuki, Kazushige MachidaAbstract:To identify the superconducting gap symmetry in ${\mathrm{CeCoIn}}_{5}$ (${T}_{c}=2.3\text{ }\text{ }\mathrm{K}$), we measured the Angle-resolved specific heat (${C}_{\ensuremath{\phi}}$) in a Field rotated around the $c$ axis down to a very low temperature, $0.05{T}_{c}$, and made detailed theoretical calculations. In a Field of 1 T, a sign reversal of the fourfold angular oscillation in ${C}_{\ensuremath{\phi}}$ was observed at $T\ensuremath{\simeq}0.1{T}_{c}$ upon entering a quasiclassical regime where the maximum of ${C}_{\ensuremath{\phi}}$ corresponds to the antinodal direction, coinciding with the Angle-resolved density of states (ADOS) calculation. The ${C}_{\ensuremath{\phi}}$ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ symmetry of this system. The ADOS-quasiclassical region is confined to a narrow $T$ and $H$ domain within $T/{T}_{c}\ensuremath{\sim}0.1$ and 1.5 T ($0.13{H}_{c2}$).
Shunichiro Kittaka - One of the best experts on this subject based on the ideXlab platform.
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Field Angle resolved landscape of non fermi liquid behavior in the quasi kagome kondo lattice cerhsn
Journal of the Physical Society of Japan, 2021Co-Authors: Shunichiro Kittaka, Yohei Kono, S Tsuda, Toshiro Takabatake, Toshiro SakakibaraAbstract:We have employed a magnetic Field Angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn...
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orientation of point nodes and nonunitary triplet pairing tuned by the easy axis magnetization in ute 2
Physical Review Research, 2020Co-Authors: Shunichiro Kittaka, Toshiro Sakakibara, Yusei Shimizu, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Dai Aoki, Kazushige MachidaAbstract:This paper studies the Field-Angle dependencies of high-quality single crystal of UTe${}_{2}$ in standard and superconductivity states. The results suggest the presence of point nodes along the $a$ axis in the superconducting gap.
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Field Angle resolved landscape of non fermi liquid behavior in the quasi kagome kondo lattice cerhsn
arXiv: Strongly Correlated Electrons, 2019Co-Authors: Shunichiro Kittaka, Yohei Kono, S Tsuda, Toshiro Takabatake, Toshiro SakakibaraAbstract:We have employed a magnetic Field Angle as a tuning parameter in a comprehensive measurement of the specific heat, magnetocaloric effect, and magnetization for the quasi-kagome Kondo lattice CeRhSn, which is considered to exhibit zero-Field quantum criticality driven by geometrical frustration. By constructing the Field-Angle-resolved landscape of the entropy, we unexpectedly revealed that the non-Fermi-liquid nature survives up to a metamagnetic crossover Field of roughly 3 T in the very narrow Field-orientation range, close to the direction parallel to the quasi-kagome plane. We propose that spin fluctuations along the hexagonal $c$ axis are the dominant driving force for the non-Fermi-liquid behavior because it is strongly suppressed by a magnetic-Field component along the $c$ axis. The multidimensional entropy landscape, which directly reflects the degeneracy of ground states, opens a new route for uncovering the nature of exotic phases in anisotropic systems.
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searching for gap zeros in sr2ruo4 via Field Angle dependent specific heat measurement
Journal of the Physical Society of Japan, 2018Co-Authors: Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, D A Sokolov, A P Mackenzie, Koki IrieAbstract:The gap structure of Sr2RuO4, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specific heat on magnetic fie...
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searching for gap zeros in sr2ruo4 via Field Angle dependent specific heat measurement
arXiv: Superconductivity, 2018Co-Authors: Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, D A Sokolov, A P Mackenzie, Koki IrieAbstract:The gap structure of Sr$_2$RuO$_4$, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specific heat on magnetic Field Angles at temperatures as low as 0.06 K ($\sim 0.04T_{\rm c}$). Except near $H_{\rm c2}$, its fourfold specific-heat oscillation under an in-plane rotating magnetic Field is unlikely to change its sign down to the lowest temperature of 0.06 K. This feature is qualitatively different from nodal quasiparticle excitations of a quasi-two-dimensional superconductor possessing vertical lines of gap minima. The overall specific-heat behavior of Sr$_2$RuO$_4$ can be explained by Doppler-shifted quasiparticles around horizontal line nodes on the Fermi surface, whose in-plane Fermi velocity is highly anisotropic, along with the occurrence of the Pauli-paramagnetic effect. These findings, in particular, the presence of horizontal line nodes in the gap, call for a reconsideration of the order parameter of Sr$_2$RuO$_4$.
Masanori Ichioka - One of the best experts on this subject based on the ideXlab platform.
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vortex state and Field Angle resolved specific heat oscillation for h ab in d wave superconductors
Journal of the Physical Society of Japan, 2010Co-Authors: Masayuki Hiragi, Kenta M Suzuki, Masanori Ichioka, Kazushige MachidaAbstract:When magnetic Field is applied parallel to the a b -plane in d x 2 - y 2 -wave superconductors, the transition of a stable vortex lattice structure, the spatial structure of local density of states, and the specific heat oscillation induced by rotation of the magnetic Field orientation are investigated by quantitative calculations based on the self-consistent Eilenberger theory. We estimate how the vortex state changes depending on the relative Angle between the node direction of the superconducting gap and magnetic Field orientation. To reproduce the sign change of specific heat oscillation observed in CeCoIn 5 , our study is perfomed by including a strong paramagnetic effect. The quantitative theoretical calculations give decisive information to analyze the experimental data on the Field-Angle dependence, and establish the Angle-resolved specific heat experiment as a spectroscopic means to identify the node position of the superconducting gap.
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vortex state and Field Angle resolved specific heat oscillation for h ab in d wave superconductors
arXiv: Superconductivity, 2010Co-Authors: Masayuki Hiragi, Kenta M Suzuki, Masanori Ichioka, Kazushige MachidaAbstract:When magnetic Field is applied parallel to the ab plane in d_{x^2-y^2}-wave superconductors, the transition of stable vortex lattice structure, spatial structure of local density of states, and specific heat oscillation by rotation of magnetic Field orientation are investigated by quantitative calculations based on the selfconsistent Eilenberger theory. We estimate how the vortex state changes depending on the relative Angle between the node-direction of the superconducting gap and magnetic Field orientation. To reproduce the sign-change of specific heat oscillation observed in CeCoIn_5, our study is done by including strong paramagnetic effect. The quantitative theoretical calculations give decisive information to analyze the experimental data on the Field-Angle dependence, and establish the Angle-resolved specific heat experiment as a spectroscopic means to identify the node-position of the superconducting gap.
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sign reversal of Field Angle resolved heat capacity oscillations in a heavy fermion superconductor cecoin5 and dx2 y2 pairing symmetry
Physical Review Letters, 2010Co-Authors: K An, Toshiro Sakakibara, Masanori Ichioka, R Settai, Yoshichika Onuki, M Hiragi, Kazushige MachidaAbstract:: To identify the superconducting gap symmetry in CeCoIn5 (T{c}=2.3 K), we measured the Angle-resolved specific heat (C{phi}) in a Field rotated around the c axis down to a very low temperature, 0.05T{c}, and made detailed theoretical calculations. In a Field of 1 T, a sign reversal of the fourfold angular oscillation in C{phi} was observed at T approximately 0.1T{c} upon entering a quasiclassical regime where the maximum of C{phi} corresponds to the antinodal direction, coinciding with the Angle-resolved density of states (ADOS) calculation. The C{phi} behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude d{x{2}-y{2}} symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/T{c} approximately 0.1 and 1.5 T (0.13H{c2}).
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sign reversal of Field Angle resolved heat capacity oscillations in a heavy fermion superconductor cecoin 5 and d x 2 y 2 pairing symmetry
Physical Review Letters, 2010Co-Authors: Toshiro Sakakibara, Masayuki Hiragi, Masanori Ichioka, R Settai, Yoshichika Onuki, Kazushige MachidaAbstract:To identify the superconducting gap symmetry in ${\mathrm{CeCoIn}}_{5}$ (${T}_{c}=2.3\text{ }\text{ }\mathrm{K}$), we measured the Angle-resolved specific heat (${C}_{\ensuremath{\phi}}$) in a Field rotated around the $c$ axis down to a very low temperature, $0.05{T}_{c}$, and made detailed theoretical calculations. In a Field of 1 T, a sign reversal of the fourfold angular oscillation in ${C}_{\ensuremath{\phi}}$ was observed at $T\ensuremath{\simeq}0.1{T}_{c}$ upon entering a quasiclassical regime where the maximum of ${C}_{\ensuremath{\phi}}$ corresponds to the antinodal direction, coinciding with the Angle-resolved density of states (ADOS) calculation. The ${C}_{\ensuremath{\phi}}$ behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ symmetry of this system. The ADOS-quasiclassical region is confined to a narrow $T$ and $H$ domain within $T/{T}_{c}\ensuremath{\sim}0.1$ and 1.5 T ($0.13{H}_{c2}$).
Yumeng Yang - One of the best experts on this subject based on the ideXlab platform.
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magnetic angular position sensor enabled by spin orbit torque
Applied Physics Letters, 2018Co-Authors: Ziyan Luo, Yumeng YangAbstract:We propose a simple scheme for magnetic angular position sensor based on current-induced spin-orbit torque effect. A full range detection of 360° is realized with a pair of Hall crosses made of heavy metal/ferromagnet heterostructures. The current axes of the two Hall crosses are aligned orthogonal to each other, such that when both devices are subject to a rotational in-plane magnetic Field, the differential Hall voltage due to current pulses of opposite polarity exhibits a sine and cosine angular dependence on the Field direction, respectively. The Field rotational Angle is then calculated from the sine and cosine output signals via the arctan2 function. A linear correspondence between the calculated and actual Field Angle is obtained in the Field range of 500–2000 Oe, with an average Angle error of 0.38°–0.65°.We propose a simple scheme for magnetic angular position sensor based on current-induced spin-orbit torque effect. A full range detection of 360° is realized with a pair of Hall crosses made of heavy metal/ferromagnet heterostructures. The current axes of the two Hall crosses are aligned orthogonal to each other, such that when both devices are subject to a rotational in-plane magnetic Field, the differential Hall voltage due to current pulses of opposite polarity exhibits a sine and cosine angular dependence on the Field direction, respectively. The Field rotational Angle is then calculated from the sine and cosine output signals via the arctan2 function. A linear correspondence between the calculated and actual Field Angle is obtained in the Field range of 500–2000 Oe, with an average Angle error of 0.38°–0.65°.
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Magnetic angular position sensor enabled by spin-orbit torque
Applied Physics Letters, 2018Co-Authors: Ziyan Luo, Yumeng Yang, Yanjun Xu, Yihong WuAbstract:We propose a simple scheme for magnetic angular position sensor based on current-induced spin-orbit torque effect. A full range detection of 360o is realized with a pair of Hall crosses made of heavy metal/ferromagnet heterostructures. The current axes of the two Hall crosses are aligned orthogonal to each other such that when both devices are subject to a rotational in-plane magnetic Field, the differential Hall voltage due to current pulses of opposite polarity exhibits a sine and cosine angular dependence on the Field direction, respectively. The Field rotational Angle is then calculated from the sine and cosine output signals via the arctan2 function. A linear correspondence between the calculated and actual Field Angle is obtained in the Field range of 500-2000 Oe, with an average Angle error of 0.38-0.65o.
