Shunichiro Kittaka
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Research Interests
Shunichiro Kittaka has a total of 339 co-authors. Here are the top co-authors by number of shared publications:
Toshiro Sakakibara
Institute for Solid State Physics, the University of Tokyo, Kashiwa, Chiba 277-8581, Japan
58 shared publicationsKazushige Machida
Department of Physics, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
26 shared publications- Yohei Kono
Chuo University
25 shared publications T. Sakakibara
18 shared publications- Shota Nakamura
Nagoya Institute of Technology
15 shared publications - Yusei Shimizu
Institute for Solid State Physics
14 shared publications
Latest Publications
- 15 March 2026
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 95 (3)
Nodal Superconductivity of UTe 2 Probed by Field-Angle-Resolved Specific Heat on a Crystal with T c = 2.1 K
- 15 March 2026
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 95 (3)
Nodal Superconductivity of UTe 2 Probed by Field-Angle-Resolved Specific Heat on a Crystal with T c = 2.1 K
- 15 January 2026
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 95 (1)
High-Resolution Magnetostriction Measurements of the Pauli-Limited Superconductor Sr 2 RuO 4
- 15 January 2026
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 95 (1)
High-Resolution Magnetostriction Measurements of the Pauli-Limited Superconductor Sr 2 RuO 4
- 22 December 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 112 (24)
Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr 2 Zn 20
- 22 December 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 112 (24)
Probing magnetic-field-induced multipolar ordering through field-angle-resolved magnetostriction and thermal expansion in PrIr 2 Zn 20
- 9 January 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 111 (4)
Rotational Grüneisen ratio: A probe for quantum criticality in anisotropic systems
- 9 January 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 111 (4)
Rotational Grüneisen ratio: A probe for quantum criticality in anisotropic systems
- Open Access
Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
Magnetic-field-angle-resolved specific heat and magnetization measurements were conducted on a ferromagnetic superconductor UCoGe with remarkable anisotropic upper critical field $H_{\rm c2}$. Although $H_{\rm c2}$ reaches a high magnetic field ($\sim 20$~T) along the $b$ axis, it is small ($\sim~0.6$~T) when a magnetic field is applied along the magnetic easy $c$-axis. This study indicates that the specific heat is abruptly suppressed when the magnetic field is applied toward the $c$ axis from the $a$ and $b$ axes in the ferromagnetic state. The field response of density of states (DOS) is anisotropic, relative to the $c$ axis, and its angle dependence is slightly singular. The Ising-type magnetic anisotropy of the ferromagnetic state is dominant even in the anisotropic reinforced superconducting state. These facts indicate that the suppression of DOS may closely relate to the superconducting state. We theoretically analyze these findings together with URhGe and UTe$_2$ by highlighting the common and distinctive features among three compounds.Open AccessAnisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
Magnetic-field-angle-resolved specific heat and magnetization measurements were conducted on a ferromagnetic superconductor UCoGe with remarkable anisotropic upper critical field $H_{\rm c2}$. Although $H_{\rm c2}$ reaches a high magnetic field ($\sim 20$~T) along the $b$ axis, it is small ($\sim~0.6$~T) when a magnetic field is applied along the magnetic easy $c$-axis. This study indicates that the specific heat is abruptly suppressed when the magnetic field is applied toward the $c$ axis from the $a$ and $b$ axes in the ferromagnetic state. The field response of density of states (DOS) is anisotropic, relative to the $c$ axis, and its angle dependence is slightly singular. The Ising-type magnetic anisotropy of the ferromagnetic state is dominant even in the anisotropic reinforced superconducting state. These facts indicate that the suppression of DOS may closely relate to the superconducting state. We theoretically analyze these findings together with URhGe and UTe$_2$ by highlighting the common and distinctive features among three compounds. - 1 December 2021
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 92 (12) , 123908
Development of high-resolution capacitive Faraday magnetometers for sub-Kelvin region
High-sensitivity capacitive Faraday magnetometers were developed for static DC magnetization measurements in a sub-Kelvin region that can be used with 3He–4He dilution refrigerators (∼50 mK) and 3He refrigerators (∼0.28 K). For high-resolution magnetization measurements, the background magnetization of the force-sensing capacitor should be as small as possible, compared with the magnetization value of a measured specimen. In this study, we succeeded in reducing the background of the capacitor in both low- and high-field regions by compensating for the diamagnetic response of a thin quartz plate, making use of Pauli-paramagnetic alloys and Van Vleck paramagnets as a counter magnetization for a diamagnetic signal. Having established an ultra-high-sensitivity capacitor, we achieved a resolution of 10−5 (∼10−5–10−6) emu in the low- (high-) field region below (above) 1 T. In particular, the newly developed capacitors with a Van Vleck paramagnet Pr0.1La0.9Be13 and paramagnetic MgAl alloys are demonstrated to be very useful for high-resolution magnetization measurements at milli-Kelvin temperatures in low and high magnetic fields, respectively.
- 1 December 2021
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 92 (12) , 123908
Development of high-resolution capacitive Faraday magnetometers for sub-Kelvin region
High-sensitivity capacitive Faraday magnetometers were developed for static DC magnetization measurements in a sub-Kelvin region that can be used with 3He–4He dilution refrigerators (∼50 mK) and 3He refrigerators (∼0.28 K). For high-resolution magnetization measurements, the background magnetization of the force-sensing capacitor should be as small as possible, compared with the magnetization value of a measured specimen. In this study, we succeeded in reducing the background of the capacitor in both low- and high-field regions by compensating for the diamagnetic response of a thin quartz plate, making use of Pauli-paramagnetic alloys and Van Vleck paramagnets as a counter magnetization for a diamagnetic signal. Having established an ultra-high-sensitivity capacitor, we achieved a resolution of 10−5 (∼10−5–10−6) emu in the low- (high-) field region below (above) 1 T. In particular, the newly developed capacitors with a Van Vleck paramagnet Pr0.1La0.9Be13 and paramagnetic MgAl alloys are demonstrated to be very useful for high-resolution magnetization measurements at milli-Kelvin temperatures in low and high magnetic fields, respectively.
- Open Access
- 6 August 2021
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 127 (6) , 069902
Erratum: Quadrupole Order in the Frustrated Pyrochlore [Phys. Rev. Lett. 116 , 217201 (2016)]DOI: https://doi.org/10.1103/PhysRevLett.127.069902
- 6 August 2021
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 127 (6) , 069902
Open AccessErratum: Quadrupole Order in the Frustrated Pyrochlore [Phys. Rev. Lett. 116 , 217201 (2016)]DOI: https://doi.org/10.1103/PhysRevLett.127.069902
- 15 April 2020
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 89 (4)
Field-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20
Ferro-quadrupole (FQ) order in the non-Kramers Γ3 doublet system PrTi2Al20 has been investigated via angle-resolved measurements of the specific heat, rotational magnetocaloric effect, and entropy, under a rotating magnetic field within the \((1\bar{1}0)\) plane. The FQ transition occurring at 2 K is robust when the magnetic field B is applied precisely along the [111] direction or in low fields below 1 T. By contrast, the magnetic field of larger than 1 T tilted away from the [111] direction sensitively changes the FQ transition to a crossover. The energy gap between the ground and first-excited states in the FQ order increases remarkably with the magnetic field in B ∥ [001], but hardly depends on the magnetic-field strength, at least up to 5 T, in the field orientation between the [111] and [110] axes. These features can be reproduced by using a phenomenological model for FQ order assuming an anisotropic field-dependent interaction between quadrupoles, which has been recently proposed to explain the field-induced first-order phase transition in PrTi2Al20. The present study demonstrates the great potential of the field-angle-resolved measurements for evaluating possible scenarios for multipole orders.- 15 April 2020
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 89 (4)
Field-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20
Ferro-quadrupole (FQ) order in the non-Kramers Γ3 doublet system PrTi2Al20 has been investigated via angle-resolved measurements of the specific heat, rotational magnetocaloric effect, and entropy, under a rotating magnetic field within the \((1\bar{1}0)\) plane. The FQ transition occurring at 2 K is robust when the magnetic field B is applied precisely along the [111] direction or in low fields below 1 T. By contrast, the magnetic field of larger than 1 T tilted away from the [111] direction sensitively changes the FQ transition to a crossover. The energy gap between the ground and first-excited states in the FQ order increases remarkably with the magnetic field in B ∥ [001], but hardly depends on the magnetic-field strength, at least up to 5 T, in the field orientation between the [111] and [110] axes. These features can be reproduced by using a phenomenological model for FQ order assuming an anisotropic field-dependent interaction between quadrupoles, which has been recently proposed to explain the field-induced first-order phase transition in PrTi2Al20. The present study demonstrates the great potential of the field-angle-resolved measurements for evaluating possible scenarios for multipole orders.- Open Access
Field-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20
Ferro-quadrupole (FQ) order in the non-Kramers $\Gamma_3$ doublet system PrTi$_2$Al$_{20}$ has been investigated via angle-resolved measurements of the specific heat, rotational magnetocaloric effect, and entropy, under a rotating magnetic field within the $(1\bar{1}0)$ plane. The FQ transition occurring at 2 K is robust when the magnetic field $B$ is applied precisely along the $[111]$ direction. By contrast, the magnetic field of larger than 1 T tilted away from the $[111]$ direction sensitively changes the FQ transition to a crossover. The energy gap between the ground and first-excited states in the FQ order increases remarkably with the magnetic field in $B \parallel [001]$, but hardly depends on the magnetic-field strength, at least up to 5 T, in the field orientation between the $[111]$ and $[110]$ axes. These features can be reproduced by using a phenomenological model for FQ order assuming an anisotropic field-dependent interaction between quadrupoles, which has been recently proposed to explain the field-induced first-order phase transition in PrTi$_2$Al$_{20}$. The present study demonstrates the great potential of the field-angle-resolved measurements for evaluating possible scenarios for multipole orders.Open AccessField-Orientation Effect on Ferro-Quadrupole Order in PrTi2Al20
Ferro-quadrupole (FQ) order in the non-Kramers $\Gamma_3$ doublet system PrTi$_2$Al$_{20}$ has been investigated via angle-resolved measurements of the specific heat, rotational magnetocaloric effect, and entropy, under a rotating magnetic field within the $(1\bar{1}0)$ plane. The FQ transition occurring at 2 K is robust when the magnetic field $B$ is applied precisely along the $[111]$ direction. By contrast, the magnetic field of larger than 1 T tilted away from the $[111]$ direction sensitively changes the FQ transition to a crossover. The energy gap between the ground and first-excited states in the FQ order increases remarkably with the magnetic field in $B \parallel [001]$, but hardly depends on the magnetic-field strength, at least up to 5 T, in the field orientation between the $[111]$ and $[110]$ axes. These features can be reproduced by using a phenomenological model for FQ order assuming an anisotropic field-dependent interaction between quadrupoles, which has been recently proposed to explain the field-induced first-order phase transition in PrTi$_2$Al$_{20}$. The present study demonstrates the great potential of the field-angle-resolved measurements for evaluating possible scenarios for multipole orders. - 15 September 2019
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 88 (9)
Superconductivity in PtSbS with a Noncentrosymmetric Cubic Crystal Structure
We report the synthesis, electronic properties, and electronic structure of ullmannite-type PtSbS, which has a cubic crystal structure without space inversion symmetry. Electrical resistivity and m...
- 15 September 2019
- Published by Physical Society of Japan in Journal of the Physical Society of Japan
- Vol. 88 (9)
Superconductivity in PtSbS with a Noncentrosymmetric Cubic Crystal Structure
We report the synthesis, electronic properties, and electronic structure of ullmannite-type PtSbS, which has a cubic crystal structure without space inversion symmetry. Electrical resistivity and m...