91 citations · 473 across the 25 of their papers we have counts for
25 papers
Discriminating superconducting fluctuations from the pseudogap in BiSrCaCuO: A magnetotransport study
Shunpei Yamaguchi, Nae Sasaki, Shintaro Adachi +13
Understanding the normal state is essential for uncovering the mechanism of high- superconductivity. We investigate magnetotransport in BiSrCaCuO and Bi$_2…
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…
Structural and Electronic Properties of a Triangular Lattice Magnet NaPrTe Compared with NaNdTe and NaTbTe
Koki Eto, Yoshihiko Okamoto, Naoyuki Katayama +3
NaPrTe2, NaNdTe2, and NaTbTe2 are found to be triangular lattice magnets with the alpha-NaFeO2 structure, where lanthanoid atoms with 4f electrons form a triangular lattice, based…
Superconductivity at 12 K in LaIOs: a 5d metal with osmium honeycomb layer
Hajime Ishikawa, Takeshi Yajima, Daisuke Nishio-Hamane +3
We discovered superconductivity at = 12 K in a layered compound LaIOs with osmium honeycomb network. Despite heavy constituent elements unfavorable for phonon mediate…
Breathing pyrochlore magnet CuGaCrS: Magnetic, thermodynamic, and dielectric properties
M. Gen, H. Ishikawa, A. Miyake +11
We investigate the crystallographic and magnetic properties of a chromium-based thiospinel CuGaCrS. From a synchrotron x-ray diffraction experiment and structural refin…
Magnetic field induced valence change in Eu(CoNi)P up to 60 T
Raito Nakamura, Azumi Ishita, Jin Nakamura +8
The solid solution 122 compounds, Eu(CoNi)P, show valence transition between divalent state and intermediate valence states at Eu, which is firmly correla…
Signatures of a magnetic superstructure phase induced by ultrahigh magnetic fields in a breathing pyrochlore antiferromagnet
M. Gen, A. Ikeda, K. Aoyama +11
The mutual coupling of spin and lattice degrees of freedom is ubiquitous in magnetic materials and potentially creates exotic magnetic states in response to the external magnetic f…
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…
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,…
GdV6Sn6: a Multi-carrier Metal with Non-magnetic 3d-electron Kagome Bands and 4f-electron Magnetism
Hajime Ishikawa, Takeshi Yajima, Mitsuaki Kawamura +2
Electronic properties of the single crystal of GdV6Sn6, where non-magnetic V-kagome layers are separated by magnetic Gd-triangular lattice, are investigated. GdV6Sn6 exhibits uniqu…
Revised phase diagram of the high- cuprate superconductor Pb-doped BiSrCaCuO revealed by anisotropic transport measurements
Keiichi Harada, Yuki Teramoto, Tomohiro Usui +9
Although phase diagrams can be leveraged to investigate high transition temperature (high-) superconductivity, the issue has not been discussed thoroughly. In this study, we e…
Pressure-induced phase transition in the - square lattice antiferromagnet RbMoOPOCl
Hikaru Takeda, Touru Yamauchi, Masashi Takigawa +2
We report results of magnetization and P NMR measurements under high pressure up to 6.4~GPa on RbMoOPOCl, which is a frustrated square-lattice antiferromagnet with compe…
Zero-energy excitation in the classical kagome antiferromagnet NaBaMnF
Shohei Hayashida, Hajime Ishikawa, Yoshihiko Okamoto +5
We performed inelastic neutron scattering measurements on a polycrystalline sample of a classical kagome antiferromagnet NaBaMnF to investigate the possibility o…
Magnetoelastic couplings in the deformed Kagomé quantum spin lattice of volborthite
Akihiko Ikeda, Shunsuke Furukawa, Oleg Janson +5
Microscopic spin interactions on a deformed Kagomé lattice of volborthite are investigated through magnetoelastic couplings. A negative longitudinal magnetostriction in the…
Magnetostriction studies up to megagauss fields using fiber Bragg grating technique
Akihiko Ikeda, Yasuhiro H. Matsuda, Daisuke Nakamura +13
We here report magnetostriction measurements under pulsed megagauss fields using a high-speed 100 MHz strain monitoring system devised using fiber Bragg grating (FBG) technique wit…
Magnetic State Selected by Magnetic Dipole Interaction in Kagome Antiferromagnet NaBaMnF
Shohei Hayashida, Hajime Ishikawa, Yoshihiko Okamoto +7
We have studied the ground state of the classical Kagome antiferromagnet NaBaMnF. Strong magnetic Bragg peaks observed in the -spacing shorter than 6.0 Å were…
Square-Lattice Heisenberg Antiferromagnets with 4 spins: AMoOPOCl (A = K, Rb)
Hajime Ishikawa, Nanako Nakamura, Makoto Yoshida +6
Magnetic properties of AMoOPOCl (A = K, Rb) with Mo ions in the 4 electronic configuration are investigated by magnetization, heat capacity and NMR measurements on…
Emergence of nontrivial magnetic excitations in a spin liquid state of kagome volborthite
Daiki Watanabe, Kaori Sugii, Masaaki Shimozawa +7
When quantum fluctuations destroy underlying long-range ordered states, novel quantum states emerge. Spin-liquid (SL) states of frustrated quantum antiferromagnets, in which highly…
Spin dynamics in the high-field phases of volborthite
M. Yoshida, K. Nawa, H. Ishikawa +13
We report single-crystal 51V NMR studies on volborthite Cu3V2O7(OH)2 2H2O, which is regarded as a quasi-two-dimensional frustrated magnet with competing ferromagnetic and antiferro…
One-Third Magnetization Plateau with a Preceding Novel Phase in Volborthite
H. Ishikawa, M. Yoshida, K. Nawa +12
We have synthesized high-quality single crystals of volborthite, a seemingly distorted kagome antiferromagnet, and carried out high-field magnetization measurements up to 74 T and…
Helical order and multiferroicity in the quasi-kagome system KCuAsO(OD)
Gøran J. Nilsen, Yoshihiko Okamoto, Hajime Ishikawa +7
Several Cu hydroxide minerals have recently been identified as candidate realizations of the kagome Heisenberg model. In this context, we have studied the distorted…
Kagome-Triangular Lattice Antiferromagnet NaBa2Mn3F11
Hajime Ishikawa, Tsuyoshi Okubo, Yoshihiko Okamoto +1
A new type of magnetically frustrated lattice is found in the layered fluoride NaBa2Mn3F11. A kagome-type array of regular triangles composed of Mn2+ ions (spin 5/2) deforms so as…
Magnetic Properties of the Spin-1/2 Deformed Kagome Antiferromagnet Edwardsite
Hajime Ishikawa, Yoshihiko Okamoto, Zenji Hiroi
We prepared a powder sample of edwardsite Cd2Cu3(SO4)2(OH)6 4H2O, which is a new candidate compound for the spin-1/2 kagome antiferromagnet, and studied its magnetic properties by…
A novel crystal polymorph of volborthite, Cu3V2O7(OH)2 2H2O
Hajime Ishikawa, Jun-ichi Yamaura, Yoshihiko Okamoto +3
A new polymorph of volborthite [tricopper(II) divanadium(V) heptaoxide dihydroxide dihydrate], Cu3V2O7(OH)2 2H2O, has been discovered in a single crystal prepared by hydrothermal s…