93 citations · 495 across the 21 of their papers we have counts for
21 papers
Synthesis of -axis textured CaKFeAs superconducting bulk via spark plasma texturing technique
Shigeyuki Ishida, Yoshihisa Kamiya, Yoshinori Tsuchiya +7
Grain alignment is a key factor that determines the performance of a superconducting bulk. In this study, the spark plasma texturing (SPT) technique was used to fabricate a CaKFe$_…
Synthesis of CaKFeAs bulk samples with high critical current density using a spark plasma sintering technique
Shigeyuki Ishida, S. Pavan Kumar Naik, Yoshinori Tsuchiya +7
A high density CaKFeAs bulk sample was successfully synthesized using a spark plasma sintering (SPS) technique. The density of the synthesized sample was 5.02 g cm,…
Na-catalyzed rapid synthesis and characterization of intercalated graphite CaC6
Akira Iyo, Hiroshi Fujihisa, Yoshito Gotoh +4
In this study, we conducted experiments on CaC6 for elucidating the Na-catalyzed formation mechanism and achieving rapid mass synthesis of graphite intercalation compounds (GICs).…
Hidden Structural and Superconducting Phase Induced in Antiperovskite Arsenide SrPdAs
Akira Iyo, Hiroshi Fujihisa, Yoshito Gotoh +5
Enriching the material variation often contributes to the progress of materials science. We have discovered for the first time antiperovskite arsenide SrPdAs and revealed a h…
High-pressure synthesis and superconductivity of the novel Laves phase BaIr2
Terunari Koshinuma, Hiroki Ninomiya, Izumi Hase +8
Superconductors comprising 5d transition metals of Ir and Pt have been widely explored because they have the potential of unique superconductivity caused by the strong spin-orbit i…
Posttreatment Effects on the Crystal Structure and Superconductivity of Ca-Free Double-Layered Cuprate SrSrCuOF
Hiroki Ninomiya, Kenji Kawashima, Hiroshi Fujihisa +6
We report the effects of low-temperature postannealing on the structural and superconducting properties of the recently discovered Ca-free double-layered cuprate, SrSrCuO$_…
Antiperovskite superconductor LaPdP with noncentrosymmetric cubic structure
Akira Iyo, Izumi Hase, Hiroshi Fujihisa +8
Antiperovskites are a promising candidate structure for the exploration of new materials. We discovered an antiperovskite phosphide, LaPdP, following our recent synthesis of…
Superconductivity-driven ferromagnetism and spin manipulation using vortices in the magnetic superconductor EuRbFe4As4
Shigeyuki Ishida, Daniel Kagerbauer, Sigrid Holleis +8
Magnetic superconductors are specific materials exhibiting two antagonistic phenomena, superconductivity and magnetism, whose mutual interaction induces various emergent phenomena,…
Superconductivity of centrosymmetric and non-centrosymmetric phases in antiperovskite (Ca,Sr)PdP
Akira Iyo, Izumi Hase, Hiroshi Fujihisa +9
In the recently discovered antiperovskite phosphide (Ca,Sr)PdP, centrosymmetric (CS) and non-centrosymmetric (NCS) superconducting phases appear depending on the Sr concentrati…
Experimental and Computational Determination of Optimal Boron Content in Layered Superconductor ScCBC
Hiroki Ninomiya, Terunari Koshinuma, Taichiro Nishio +9
It is generally difficult to quantify the amounts of light elements in materials because of their low X-ray-scattering power, as this means that they cannot be easily estimated via…
Structural phase transitions and superconductivity induced in antiperovskite phosphide CaPdP
Akira Iyo, Hiroshi Fujihisa, Yoshito Gotoh +7
In this study, we succeeded in synthesizing new antiperovskite phosphides PdP ( = Ca, Sr, Ba) and discovered the appearance of a superconducting phase (0.17 $\…
Superconductivity in a Scandium Borocarbide with a Layered Crystal Structure
Hiroki Ninomiya, Kunihiko Oka, Izumi Hase +8
The discovery of nearly room-temperature superconductivity in superhydrides has motivated further materials research for conventional superconductors. To realize the moderately hig…
Superconductivity induced by Mg deficiency in non-centrosymmetric phosphide MgRhP
Akira Iyo, Izumi Hase, Hiroshi Fujihisa +7
The search for non-centrosymmetric superconductors that may exhibit unusual physical properties and unconventional superconductivity has yielded the synthesis of a non-centrosymmet…
Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4
Shigeyuki Ishida, Akira Iyo, Hiraku Ogino +10
The lossless current-carrying capacity of a superconductor is limited by its critical current density (Jc). A key to enhance Jc towards real-life applications is engineering defect…
Coexisting spin resonance and long-range magnetic order of Eu in EuRbFeAs
K. Iida, Y. Nagai, S. Ishida +14
Magnetic excitations and magnetic structure of EuRbFeAs were investigated by inelastic neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) c…
Superconductivity in Uncollapsed Tetragonal LaFe2As2
Akira Iyo, Shigeyuki Ishida, Hiroshi Fujihisa +5
We report synthesis, crystal structure and superconductivity in ThCr2Si2-type LaFe2As2 (La122). La122 was synthesized at 960°C for 1.5 h under a pressure of 3.4 GPa. An as-synthesi…
Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe4As4
K. Iida, M. Ishikado, Y. Nagai +7
The dynamical spin susceptibility in the new-structure-type iron-based superconductor CaKFeAs was investigated by using a combination of inelastic neutron scattering (INS)…
NMR and NQR Studies on Non-centrosymmetric Superconductors Re7B3, LaBiPt, and BiPd
Kazuaki Matano, Satoki Maeda, Hiroki Sawaoka +7
We report the nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements for non-centrosymmetric superconductors Re7B3, LaBiPt, and BiPd containing heavy…
Variations on the Supersymmetric Q6 Model of Flavor
K. S. Babu, Kenji Kawashima, Jisuke Kubo
We observe that a recently proposed supersymmetric model with Q6 flavor symmetry admits a new CP violating ground state. A new sum rule for the quark mixing parameters emerges, whi…
Testing the new CP phase in a Supersymmetric Model with Q6 Family Symmetry by Bs Mixing
Kenji Kawashima, Jisuke Kubo, Alexander Lenz
The new contribution to the non-diagonal matrix element M_12 of the neutral B_s meson system is investigated in a supersymmetric extension of the standard model based on the discre…
Magnetic and superconducting phase diagram of electron-doped PrLaCeCuO
M. Fujita, T. Kubo, S. Kuroshima +5
We have investigated the magnetism and the superconductivity of an electron-doped PrLaCeCuO (PLCCO) using single crystal and powder samples by means of zero-fie…