84 citations · 990 across the 49 of their papers we have counts for
49 papers
Coexisting electronic smectic liquid crystal and superconductivity in a Si square-net semimetal
Christopher J. Butler, Toshiya Ikenobe, Ming-Chun Jiang +6
Electronic nematic and smectic liquid crystals are spontaneous symmetry-breaking phases that are seen to precede or coexist with enigmatic unconventional superconducting states in…
Pinalites: Optical properties and Quantum Magnetism of Heteroanionic AMOX Compounds
Daigorou Hirai
Heteroanionic compounds, which contain two or more types of anions, have emerged as a promising class of materials with diverse properties and functionalities. In this paper, I rev…
Superconductivity in High-Entropy Antimonide MPtSb (M = equimolar Ru, Rh, Pd, and Ir)
Daigorou Hirai, Naoto Uematsu, Koh Saitoh +2
The high-entropy concept was applied to the synthesis of transition-metal antimonides, M1-xPtxSb (M = equimolar Ru, Rh, Pd, and Ir). High-entropy antimonide samples crystallized in…
Topological Semimetal KAlGe with Novel Electronic Instability
Toshiya Ikenobe, Takahiro Yamada, Jun-ichi Yamaura +6
Compounds with the anti-PbFCl structure exhibit a variety of electronic instabilities and intriguing physical properties. NaAlSi and NaAlGe are similar topological nodal-line semim…
Odd-parity multipole order in the spin-orbit coupled metallic pyrochlore PbReO
Yuki Nakayama, Daigorou Hirai, Hajime Sagayama +6
The pyrochlore oxide Pb2Re2O7-δ (PRO) is a candidate spin-orbit-coupled metal (SOCM) that exhibits a structural phase transition with inversion symmetry breaking. In this study, we…
Superconductivity in Ternary Germanide ScPdGe and Silicide ScPdSi
Yusaku Shinoda, Yoshihiko Okamoto, Youichi Yamakawa +4
The electronic properties of ScPdGe and ScPdSi, crystallizing in the hexagonal ZrNiAl and orthorhombic TiNiSi structures, respectively, are investigated. ScPdGe and ScPdSi are foun…
Superconductivity induced by doping holes in the nodal-line semimetal NaAlGe
Toshiya Ikenobe, Takahiro Yamada, Daigorou Hirai +2
The nodal-line semimetals NaAlSi and NaAlGe have significantly different ground states despite having similar electronic structures: NaAlSi exhibits superconductivity below 7 K, wh…
Successive phase transitions of the spin-orbit-coupled metal Cd2Re2O7 probed by high-resolution synchrotron x-ray diffraction
Daigorou Hirai, Atsuhito Fukui, Hajime Sagayama +2
The 5d pyrochlore oxide superconductor Cd2Re2O7 (CRO) has attracted significant interest as a spin-orbit-coupled metal (SOCM) that spontaneously undergoes a phase transition to an…
Fermi surface and light quasi particles in hourglass nodal chain metal \b{eta}-ReO2
Daigorou Hirai, Takahito Anbai, Takako Konoike +8
Quantum oscillations in magnetic torque and electrical resistivity were measured to investigate the electronic structure of \b{eta}-ReO2, a candidate hourglass nodal chain metal (D…
Linear Trimer Formation by Three-Center-Four-Electron Bonding in RuP
Daigorou Hirai, Keita Kojima, Naoyuki Katayama +3
In molecules like hydrogen, most chemical bonds are formed by sharing two electrons from each atom in the bonding molecular orbital (two-center-two-electron (2c2e) bonding). There…
Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals
Yusaku Shinoda, Yoshihiko Okamoto, Youichi Yamakawa +3
We report the discovery of bulk superconductivity in Sc6MTe2 with seven kinds of transition-metal elements M. The critical temperatures for M = 3d elements are higher than those fo…
Large Magnetic-Field-Induced Strains in Sintered Chromium Tellurides
Yuki Kubota, Yoshihiko Okamoto, Tomoya Kanematsu +3
Sintered samples of Cr3Te4 and Cr2Te3 are found to show large strains accompanied by large volume changes under a magnetic field. In Cr3Te4, volume increases of deltaV/V = 500-1170…
Electronic Properties of Pyrochlore-Type Ca2Ir2O7
Yuki Nakayama, Yoshihiko Okamoto, Daigorou Hirai +1
The electrical resistivity, magnetic susceptibility, and heat capacity of sintered samples of Ca2Ir2O7, in which pentavalent Ir atoms with 5d4 electron configuration form a pyrochl…
Dimensional reduction and incommensurate dynamic correlations in the triangular-lattice antiferromagnet CaReOCl
S. A. Zvyagin, A. N. Ponomaryov, J. Wosnitza +7
The observation of spinon excitations in the triangular antiferromagnet CaReOCl reveals a quasi-one-dimensional (1D) nature of magnetic correlations, in…
Pseudogap Formation in the Nodal-Line Semimetal NaAlGe
Takahiro Yamada, Daigorou Hirai, Tamio Oguchi +2
NaAlSi and NaAlGe are isostructural and isoelectronic semimetals with topological nodal lines close to the Fermi level. Despite having virtually identical electronic structures, Na…
Pyrochlore Oxide Hg2Os2O7 on Verge of Metal-Insulator Boundary
Kota Kataoka, Daigorou Hirai, Akihiro Koda +3
Semimetallic osmium pyrochlore oxide Cd2Os2O7 undergoes a magnetic transition to an all-in-all-out (AIAO)-type order at 227 K, followed by a crossover to an AIAO insulator at aroun…
Unusual Resistive Transitions in the Nodal-Line Semimetallic Superconductor NaAlSi
Daigorou Hirai, Toshiya Ikenobe, Takahiro Yamada +2
NaAlSi is a quasi-two-dimensional semimetal with superconductivity below Tc = 6.8 K and a band structure characterized by nodal lines near the Fermi level and potential topological…
Interplay between quadrupolar and magnetic interactions in 5 double perovskite BaMgReO under pressure
Hiroto Arima, Yoshiaki Oshita, Daigorou Hirai +2
We measured the electrical resistivity, AC magnetic susceptibility, and specific heat of the cubic double perovskite BaMgReO under pressure. The application of pressure lea…
Dimer Crystallization Induced by Elemental Substitution in the Honeycomb Lattice of Ru1-xOsxCl3
Kota Kataoka, Dirk Wulferding, Takeshi Yajima +5
Substitution effects of Os for Ru in α-RuCl3 are investigated in a wide composition range of 0 =< x =< 0.67 in Ru1-xOsxCl3 by X-ray and electron diffraction, magnetic susceptibilit…
Phase transition in the 5d1 double perovskite Ba2CaReO6 induced by high magnetic field
Hajime Ishikawa, Daigorou Hirai, Akihiko Ikeda +6
Magnetic properties of an antiferromagnetic double perovskite oxide Ba2CaReO6, where Re6+ (5d1) ions with large spin-orbit coupling are arranged on the face-centered-cubic lattice,…
Extremely large magnetoresistance in the hourglass Dirac loop chain metal β-ReO
Daigorou Hirai, Takahito Anbai, Shinya Uji +2
The transport and thermodynamic properties of -ReO crystallizing in a nonsymmorphic structure were studied using high-quality single crystals. An extremely large magnetore…
Anisotropic Triangular Lattice Realized in Rhenium Oxychlorides A3ReO5Cl2 (A = Ba and Sr)
Daigorou Hirai, Takeshi Yajima, Kazuhiro Nawa +2
We report the synthesis, crystal structure, and magnetic properties of two new quantum antiferromagnets A3ReO5Cl2 (A = Sr and Ba). The crystal structure is isostructural with the m…
Possible quadrupole order in tetragonal Ba2CdReO6 and chemical trend in the ground states of 5d1 double perovskites
Daigorou Hirai, Zenji Hiroi
The synthesis and physical properties of the double perovskite (DP) compound Ba2CdReO6 with the 5d1 electronic configuration are reported. Three successive phases originating from…
Superconductivity in the Topological Nodal-line Semimetal NaAlSi
Takahiro Yamada, Daigorou Hirai, Hisanori Yamane +1
NaAlSi is an sp electron superconductor crystallizing in a layered structure of the anti-PbFCl type with a relatively high transition temperature Tc of ~7 K. Recent electronic stat…