494 citations · 2.3k across the 67 of their papers we have counts for
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Nodal Superconductivity of UTe Probed by Field-Angle-Resolved Specific Heat on a Crystal with K
Kaito Totsuka, Yohei Kono, Yusei Shimizu +6
Field-angle-resolved specific-heat measurements were performed on a clean single crystal of a spin-triplet superconductor UTe with K and a low residual electron…
High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4
Shunichiro Kittaka, Yohei Kono, Toshiro Sakakibara +4
We performed high-resolution magnetostriction measurements on the Pauli-limited superconductor SrRuO using high-quality single crystals. A first-order superconducting trans…
Multiple magnetic orders discovered in the superconducting state of EuFe(AsP)
Nan Zhou, Yue Sun, Ivan S. Veshchunov +13
The interplay between superconductivity and magnetism is an important subject in condensed matter physics. EuFeAs-based iron pnictides could offer an interesting platea…
Modulation vector of the Fulde-Ferrell-Larkin-Ovchinnikov state in CeCoIn5 revealed by high-resolution magnetostriction measurements
Shunichiro Kittaka, Yohei Kono, Kaito Tsunashima +6
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is an exotic superconducting phase formed by Cooper pairs with finite center-of-mass momentum . On theoretical grounds, the sup…
Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
Shota Nakamura, Shunichiro Kittaka, Kazushige Machida +4
Magnetic-field-angle-resolved specific heat and magnetization measurements were conducted on a ferromagnetic superconductor UCoGe with remarkable anisotropic upper critical field $…
Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe
Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara +8
We investigate the superconducting gap function of topological superconductor PbTaSe. Temperature, magnetic field, and three-dimensional (3D) field-angle dependences of the spe…
Orientation of point nodes and nonunitary triplet pairing tuned by the easy-axis magnetization in UTe2
Shunichiro Kittaka, Yusei Shimizu, Toshiro Sakakibara +6
The gap structure of a novel uranium-based superconductor UTe, situated in the vicinity of ferromagnetic quantum criticality, has been investigated via specific-heat …
Superconductivity in PtSbS with a Noncentrosymmetric Cubic Crystal Structure
Ryosuke Mizutani, Yoshihiko Okamoto, Hayate Nagaso +7
We report the synthesis, electronic properties, and electronic structure of ullmannite-type PtSbS, which has a cubic crystal structure without space inversion symmetry. Electrical…
Evidence for nematic superconductivity of topological surface states in PbTaSe2
Tian Le, Yue Sun, Hui-Ke Jin +16
Spontaneous symmetry breaking has been a paradigm to describe the phase transitions in condensed matter physics. In addition to the continuous electromagnetic gauge symmetry, an un…
Quasi-particle evidence for the nematic state above in SrBiSe
Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara +6
In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. Electronic nematic states have been observed in various un…
Disorder-sensitive node-like small gap in FeSe
Yue Sun, Shunichiro Kittaka, Shota Nakamura +8
We investigate the band structure, nematic state and superconducting gap structure of two selected FeSe single crystals containing different amount of disorder. Transport and angle…
Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement
Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara +9
The gap structure of SrRuO, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specif…
Quasiparticle Excitations and Evidence for Superconducting Double Transitions in Monocrystalline U0.97Th0.03Be13
Yusei Shimizu, Shunichiro Kittaka, Shota Nakamura +5
Superconducting (SC) gap symmetry and magnetic response of cubic U0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dc magnetization measurements using a sing…
Gap structure of FeSe determined by field-angle-resolved specific heat measurements
Yue Sun, Shunichiro Kittaka, Shota Nakamura +6
Quasiparticle excitations in FeSe were studied by means of specific heat () measurements on a high-quality single crystal under rotating magnetic fields. The field dependence of…
Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2
T. Yamashita, T. Takenaka, Y. Tokiwa +16
In exotic superconductors including high- copper-oxides, the interactions mediating electron Cooper-pairing are widely considered to have a magnetic rather than the convention…
Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2
Shunichiro Kittaka, Yuya Aoki, Yasuyuki Shimura +7
This paper presents the results of specific-heat and magnetization measurements, in particular their field-orientation dependence, on the first discovered heavy-fermion superconduc…
Evidence for chiral d-wave superconductivity in URu2Si2 from the field-angle variation of its specific heat
Shunichiro Kittaka, Yusei Shimizu, Toshiro Sakakibara +7
Low-energy quasiparticle (QP) excitations in the heavy-fermion superconductor URuSi were investigated by specific-heat measurements of a high-quality single…
Sharp magnetization jump at the first-order superconducting transition in Sr2RuO4
Shunichiro Kittaka, Akira Kasahara, Toshiro Sakakibara +5
The magnetization and magnetic torque of a high-quality single crystal of SrRuO have been measured down to 0.1 K under a precise control of the magnetic-field orientation.…
Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13
Yusei Shimizu, Shunichiro Kittaka, Toshiro Sakakibara +5
Low-energy quasiparticle excitations in the superconducting (SC) state of UBe were studied by means of specific-heat () measurements in a rotating field. Quite unexpected…
Thermodynamic Study of Nodal Structure and Multiband Superconductivity of KFe2As2
Shunichiro Kittaka, Yuya Aoki, Naoki Kase +12
The temperature, field, and field-orientation dependences of the electronic specific heat Ce of the ironpnictide superconductor KFe2As2 have been investigated. Thermodynamic eviden…
Verification of Anisotropic s-Wave Superconducting Gap Structure in CeRu2 from Low-Temperature Field-Angle-Resolved Specific Heat Measurements
Shunichiro Kittaka, Toshiro Sakakibara, Masato Hedo +2
The field-angle-resolved specific heat C(T,H,phi) of the f-electron superconductor CeRu2 (Tc=6.3 K) has been measured at low temperatures down to 90 mK on two single crystals of sl…
Multiband superconductivity with unexpected deficiency of nodal quasiparticles in CeCu2Si2
Shunichiro Kittaka, Yuya Aoki, Yasuyuki Shimura +6
Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical example of Cooper pairs formed by strongly correlated electrons. For more than 30 years, it has been beli…
Anomalous Field-Angle Dependence of the Specific Heat of Heavy-Fermion Superconductor UPt3
Shunichiro Kittaka, Koji An, Toshiro Sakakibara +5
We have investigated the field-angle variation of the specific heat C(H, phi, theta) of the heavy-fermion superconductor UPt3 at low temperatures T down to 50 mK, where phi and the…
Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
Yoshiteru Maeno, Shunichiro Kittaka, Takuji Nomura +2
This review presents a summary and evaluations of the superconducting properties of the layered ruthenate Sr2RuO4 as they are known in the autumn of 2011. This paper appends the ma…