60 citations · 329 across the 22 of their papers we have counts for
22 papers
A field-induced reentrant insulator state of a gap-closed topological insulator (Bi_{1-x}Sb_x) in quantum-limit states
Y. Kinoshita, T. Fujita, R. Kurihara +4
In the extreme quantum limit states under high magnetic fields, enhanced electronic correlation effects can stabilize anomalous quantum states. Using band-tuning with a magnetic fi…
High-Field Ultrasonic Study of CeIrIn
Ryosuke Kurihara, Atsushi Miyake, Ryoma Tsunoda +3
We performed ultrasonic and temperature measurements under pulsed magnetic fields on CeIrIn to investigate whether or not the origin of metamagnetic transition and field-induce…
Field-tunable Weyl points and large anomalous Hall effects in degenerate magnetic semiconductor EuMgBi
M. Kondo, M. Ochi, R. Kurihara +10
Magnets, with topologically-nontrivial Dirac/Weyl points, have recently attracted significant attention owing to the unconventional physical properties, such as large anomalous Hal…
SmI3: 4f5 honeycomb magnet with spin-orbital entangled Γ7 Kramers doublet
Hajime Ishikawa, Ryosuke Kurihara, Takeshi Yajima +5
We report magnetic properties of a 4f-honeycomb iodide SmI3 made up of edge-shared network of SmI6 octahedra. High temperature magnetic susceptibility indicates Γ7 Kramers doublet…
Highly anisotropic geometrical Hall effect via f-d exchange fields in doped pyrochlore molybdates
Hikaru Fukuda, Kentaro Ueda, Yoshio Kaneko +6
When a conduction electron couples with a non-coplanar localized magnetic moment, the realspace Berry curvature is exerted to cause the geometrical Hall effect, which is not simply…
Ferroelectric transition of a chiral molecular crystal BINOL2DMSO
Toshihiro Nomura, Takeshi Yajima, Zhuo Yang +7
We report dielectric, thermodynamical, acoustic, and optical properties of a chiral molecular crystal, 1,1'-bi-2-naphthol 2-dimethylsulfoxide (BINOL2DMSO). We find two successive p…
Elastic Soft Mode and Electric Quadrupole Response in Excitonic Insulator Candidate (TaV)NiSe: Contribution of Electron-Phonon Interaction
Ryosuke Kurihara, Yusuke Hirose, Sumika Sano +4
We performed ultrasonic measurements on (TaV)NiSe to investigate the contribution of acoustic phonons at the zone center to structural and possible exci…
Extremely high upper critical field in BiCh-based (Ch: S and Se) layered superconductor LaOFBiSSe ( = 0.22 and 0.69)
Kazuhisa Hoshi, Ryosuke Kurihara, Yosuke Goto +2
Centrosymmetric compounds with local inversion symmetry breaking have tremendously interesting and intriguing physical properties. In this study, we focus on a BiCh-based (Ch:…
Field-induced multiple metal-insulator crossovers of correlated Dirac electrons of perovskite CaIrO
R. Yamada, J. Fujioka, M. Kawamura +10
The interplay between electron correlation and topology of relativistic electrons may lead to a new stage of the research on quantum materials and emergent functions. The emergence…
Quantum transport of topological spin solitonsin a one-dimensional organic ferroelectric
Shusaku Imajo, Atsushi Miyake, Ryosuke Kurihara +4
We report the dielectric, magnetic, and ultrasonic properties of a one-dimensional organic salt TTF-QBrI. These indicate that TTF-QBrI shows a ferroelectric spin-Peierls (F…
Quantum transport observed in films of magnetic topological semimetal EuSb
Mizuki Ohno, Masaki Uchida, Ryosuke Kurihara +10
We report fabrication of EuSb single-crystalline films and investigation of their quantum transport. First-principles calculations demonstrate that EuSb is a magnetic topol…
Tunable spin-valley coupling in layered polar Dirac metals
Masaki Kondo, Masayuki Ochi, Tatsuhiro Kojima +9
In non-centrosymmetric metals, spin-orbit coupling (SOC) induces momentum-dependent spin polarization at the Fermi surfaces. This is exemplified by the valley-contrasting spin pola…
Field-induced valence fluctuation in YbB
R. Kurihara, A. Miyake, M. Tokunaga +8
We performed high-magnetic-field ultrasonic experiments on YbB up to 59 T to investigate the valence fluctuations in Yb ions. In zero field, the longitudinal elastic constan…
Giant anomalous Hall effect from spin-chirality scattering in a chiral magnet
Yukako Fujishiro, Naoya Kanazawa, Ryosuke Kurihara +10
The electrical Hall effect can be significantly enhanced through the interplay of the conduction electrons with magnetism, which is known as the anomalous Hall effect (AHE). Wherea…
Anisotropic Fully-Gapped Superconductivity Possibly Mediated by Charge Fluctuations in a Nondimeric Organic Complex
Shusaku Imajo, Hiroki Akutsu, Ryosuke Kurihara +5
We investigate low-temperature electronic properties of the nondimeric organic superconductor -(BEDT-TTF)[(HO)Ga(CO)]PhNO. By examining ul…
Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr(IrRh)O
H. Murayama, K. Ishida, R. Kurihara +10
An anapole state that breaks inversion and time reversal symmetries with preserving translation symmetry of underlying lattice has aroused great interest as a new quantum state, bu…
High-Field Ultrasonic Study of Quadrupole Ordering and Crystal Symmetry Breaking in CeRhIn5
R. Kurihara, A. Miyake, M. Tokunaga +2
We performed an ultrasonic measurement for the heavy-fermion compound CeRhIn to investigate the origin of the field-induced anisotropic phase in high magnetic fields. The trans…
Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb
H. Sakai, H. Fujimura, S. Sakuragi +16
Unconventional features of relativistic Dirac/Weyl quasi-particles in topological materials are most evidently manifested in the 2D quantum Hall effect (QHE), whose variety is furt…
Effect of quenched disorder on a quantum spin liquid state of triangular-lattice antiferromagnet 1T-TaS
H. Murayama, Y. Sato, T. Taniguchi +12
A quantum spin liquid (QSL) is an exotic state of matter characterized by quantum entanglement and the absence of any broken symmetry. A long-standing open problem, which is a key…
Quantized surface transport in topological Dirac semimetal films
Shinichi Nishihaya, Masaki Uchida, Yusuke Nakazawa +7
Unconventional surface states protected by non-trivial bulk orders are sources of various exotic quantum transport in topological materials. One prominent example is the unique mag…
Diagonal Nematicity in the Pseudogap Phase of HgBaCuO
H. Murayama, Y. Sato, R. Kurihara +11
The pseudogap phenomenon in cuprates is the most mysterious puzzle in the research of high-temperature superconductivity. In particular, whether the pseudogap is associated with a…
Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
Ryosuke Kurihara, Keisuke Mitsumoto, Mitsuhiro Akatsu +4
Ultrasonic measurements have been carried out to investigate the critical dynamics of structural and superconducting transitions due to degenerate orbital bands in iron pnictide co…