Publications (31)
Superconductivity enhanced by -band filling in LaAl with = Mo and W
Rumika Miyawaki, Naoki Nakamura, Ryuji Higashinaka +2
Electrical resistivity, magnetic susceptibility, and specific heat measurements on single crystals of LaAl with = Mo and W revealed that these compounds exhibit s…
Fermi Surface Nesting Driving the RKKY Interaction in the Centrosymmetric Skyrmion Magnet Gd2PdSi3
Yuyang Dong, Yosuke Arai, Kenta Kuroda +11
The magnetic skyrmions generated in a centrosymmetric crystal were recently first discovered in Gd2PdSi3. In light of this, we observe the electronic structure by angle-resolved ph…
Pronounced - Log T Divergence in Specific Heat of Nonmetallic CeOBiS: A Mother Phase of BiS-Based Superconductor
Ryuji Higashinaka, Takuya Asano, Takuya Nakashima +5
The low-temperature properties of CeOBiS single crystals are studied by electrical resistivity, magnetization, and specific heat measurements. Ce 4f -electrons are found to be…
Intrinsic Phase Diagram of Superconductivity in the BiCh2-based System Without In-plane Disorder
Kouhei Nagasaka, Atsuhiro Nishida, Rajveer Jha +11
We have investigated the crystal structure and physical properties of LaO1-xFxBiSSe to reveal the intrinsic superconductivity phase diagram of the BiCh2-based layered compound fami…
Effect of Indium doping on the superconductivity of layered oxychalcogenide La2O2Bi3Ag1-xInxS6
Rajveer Jha, Yosuke Goto, Tatsuma D Matsuda +2
We report on the substitution effect of Indium (In) at the Ag site of layered oxychalcogenide La2O2Bi3Ag1-xInxS6. The Tc decreases with increasing In concentration. A hump in the n…
Evolution of 4f-Electron States in the Metal-Insulator Transition of PrRuP
Kazuaki Iwasa, Lijie Hao, Keitaro Kuwahara +7
Magnetic excitations of the filled skutterudite PrRu4P12 exhibiting a metal-insulator (M-I) transition at TM-I= 63 K were studied by inelastic neutron scattering experiment. The sp…
Na1-xSn2P2 as a new member of van der Waals-type layered tin pnictide superconductors
Yosuke Goto, Akira Miura, Chikako Moriyoshi +4
Superconductors with a van der Waals (vdW) structure have attracted a considerable interest because of the possibility for truly two-dimensional (2D) superconducting systems. We re…
Observation of Magnetic Monopoles in Spin Ice
Hiroaki Kadowaki, Naohiro Doi, Yuji Aoki +5
Excitations from a strongly frustrated system, the kagome ice state of the spin ice Dy2Ti2O7 under magnetic fields along a [111] direction, have been studied. They are theoreticall…
Pseudogap and Fermi arc induced by Fermi surface nesting in a centrosymmetric skyrmion magnet
Yuyang Dong, Yuto Kinoshita, Masayuki Ochi +12
Skyrmions in noncentrosymmetric materials are believed to occur due to the Dzyaloshinskii-Moriya interaction. By contrast, the skyrmion formation mechanism in centrosymmetric mater…
Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex
Ryosuke Kiyama, Yosuke Goto, Kazuhisa Hoshi +7
We report the Se substitution effects on the crystal structure, superconducting properties, and valence states of self-doped BiCh2-based compound CeOBiS2-xSex. Polycrystalline CeOB…
f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu4P12
Yuji Aoki, Takahiro Namiki, Shanta R. Saha +6
In the unconventional f-electron-associated charge order phase of filled skutterudite PrRu4P12, the low-temperature behaviors of the triplet crystalline-electric-field ground state…
Superconductivity in Se-doped La2O2Bi2Pb2S6-xSex with a Bi2Pb2Ch4-type thick conducting layer
Rajveer Jha, Yosuke Goto, Tatsuma D. Matsuda +2
La2O2Bi2Pb2S6 is a layered Bi-based oxychalcogenide with a thick four-layer-type conducting layer. Although La2O2Bi2Pb2S6 is a structural analogue of La2O2Bi3AgS6, which is a super…
SnAs-based layered superconductor NaSn2As2
Yosuke Goto, Akira Yamada, Tatsuma D. Matsuda +2
Superconductivity with exotic properties has often been discovered in materials with a layered (two-dimensional) crystal structure. The low dimensionality affects the electronic st…
Specific Heat and Electrical Transport Properties of Sn0.8Ag0.2Te Superconductor
Yoshikazu Mizuguchi, Akira Yamada, Ryuji Higashinaka +4
Sn0.8Ag0.2Te is a new superconductor with Tc ~ 2.4 K. The superconducting properties of Sn0.8Ag0.2Te have been investigated by specific heat measurements under magnetic fields. Bul…
Low Curie-temperature ferromagnetic phase in SmPt2Cd20 possibly accompanied by strong quantum fluctuations
Akira Yamada, Shota Oike, Ryuji Higashinaka +2
Electrical resistivity, magnetization and specific heat have been measured for single crystals of SmPtCd. It has been found that SmPtCd exhibits a ferroma…
Bulk Superconductivity Induced by In-plane Chemical Pressure Effect in Eu0.5La0.5FBiS2-xSex
Gen Jinno, Rajveer Jha, Akira Yamada +6
We have investigated Se substitution effect to superconductivity of an optimally-doped BiS2-based superconductor Eu0.5La0.5FBiS2. Eu0.5La0.5FBiS2-xSex samples with x = 0-1 were syn…
Bulk superconductivity in La2O2M4S6-type layered oxychalcogenide La2O2Bi3Ag0.6Sn0.4S5.7Se0.3
Rajveer Jha, Yosuke Goto, Tatsuma D. Matsuda +4
Recently, we reported the observation of superconductivity at ~0.5 K in a La2O2M4S6-type (M: metal) layered oxychalcogenide La2O2Bi3AgS6, which is a layered compound related to the…
Possible Existence of Partially Disordered Sm Ions in Magnetically Ordered State of Ising Magnet SmPt2Si2: a Single Crystal Study
Kengo Fushiya, Tatsuma D. Matsuda, Ryuji Higashinaka +2
We have succeeded in growing single crystals of SmPt2Si2 and have performed electrical resistivity, magnetization and specific heat measurements. The magnetic susceptibility shows…
Exotic Heavy-Fermion State in Filled Skutterudite SmOs4Sb12
Shotaro Sanada, Yuji Aoki, Hidekazu Aoki +4
Specific heat and transport measurements have revealed an unconventional heavy-fermion (HF) state in SmOs4Sb12 single crystals. The electronic specific-heat coefficient (gamma=0.82…
Incommensurate Magnetic Ordered Phase with Enhanced Low-Temperature Magnetic Specific Heat in SmAuAl
Ryuji Higashinaka, Takuma Iwami, Kohsuke Saitou +12
Neutron scattering and muon spin rotation (SR) measurements on single-crystal SmAuAl reveal magnetically ordered states associated with successive transitions at $T_{\r…
Unusual Field-Insensitive Phase Transition and Kondo Behavior in SmTiAl
Ryuji Higashinaka, Takuya Maruyama, Akihiro Nakama +3
Magnetization, electrical resistivity and specific heat measurements were performed on high-quality single crystalline SmTiAl (residual resistivity ratio 40) grow…
Linear Magnetoresistance and Type-I Superconductivity in -IrSn
Nazir Ahmad, Shunsuke Shimada, Takumi Hasegawa +6
Layered material -IrSn (, , #142), whose electron bands have symmetry-enforced Dirac points, was investigated using high-quality single crystals. It…
Superconductivity in In-doped AgSnBiTe3 with possible band inversion
Tsubasa Mitobe, Kazuhisa Hoshi, Md. Riad Kasem +9
We investigated the chemical pressure effects on structural and electronic properties of SnTe-based material using partial substitution of Sn by Ag0.5Bi0.5, which results in lattic…
Role of p-f Hybridization in the Metal-Non-Metal Transition of PrRu4P12
Kazuaki Iwasa, Lijie Hao, Tomoo Hasegawa +10
Electronic state evolution in the metal-non-metal transition of PrRu4P12 has been studied by X-ray and polarized neutron diffraction experiments. It has been revealed that, in the…
Anomalous magnetotransport properties of high-quality single crystals of Weyl semimetal WTe2: Sign change of Hall resistivity
Rajveer Jha, Ryuji Higashinaka, Tatsuma D. Matsuda +2
We report on a systematic study of Hall effect using high quality single crystals of type-II Weyl semimetal WTe2 with the applied magnetic field B//c. The residual resistivity rati…
Enhanced superconductivity by Na doping in SnAs-based layered compound NaSnAs
Hao Yuwen, Yosuke Goto, Rajveer Jha +6
Superconducting transition temperature (Tc) reported in SnAs-based layered compound NaSnAs varies from 1.2 to 1.6 K, implying that its superconductivity is critically sensi…
Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure
Md. Riad Kasem, Kazuhisa Hoshi, Rajveer Jha +6
High-entropy-alloy-type tellurides M-Te, which contain five different metals of M = Ag, In, Cd, Sn, Sb, Pb, and Bi, were synthesized using high pressure synthesis. Structural chara…
Superconductivity in layered Oxychalcogenide La2O2Bi3AgS6
Rajveer Jha, Yosuke Goto, Ryuji Higashinaka +3
We report the superconductivity in layered oxychalcogenide La2O2Bi3AgS6 compound. The La2O2Bi3AgS6 compound has been reported recently by our group, which has a tetragonal structur…
Specific Heat Study of Non-Fermi Liquid Behavior in CeNi_2Ge_2: Anomalous Peak in Quasi-Particle Density-of-States
Yuji Aoki, Jun Urakawa, Hitoshi Sugawara +3
To investigate the non-Fermi liquid (NFL) behavior in a nonalloyed system CeNi_2Ge_2, we have measured the temperature and field dependences of the specific heat C on a CeNi_2Ge_2…
Detection of hole pockets in the candidate type-II Weyl semimetal MoTe from Shubnikov-de Haas quantum oscillations
Y. J. Hu, W. C. Yu, Kwing To Lai +12
The bulk electronic structure of -MoTe features large hole Fermi pockets at the Brillouin zone center () and two electron Fermi surfaces along the direction. Ho…
Superconductivity in Cage Compounds LaAl with = Ti, V, Nb, and Ta
Akira Yamada, Ryuji Higashinaka, Tatsuma D. Matsuda +1
Electrical resistivity, magnetic susceptibility, and specific heat measurements on single crystals of LaAl ( = Ti, V, Nb, and Ta) revealed that these four compou…