28 citations · 138 across the 21 of their papers we have counts for
21 papers
Direct Observation of Vortices and Antivortices Generation in Phase-Separated Superconductor Sn-Pb Solder
Hiroto Arima, Takumi Murakami, Yuto Kinoshita +4
Quantized vortices in type-II superconductors provide insights into the mechanisms of superconductivity. However, the generation of antivortices, characterized by magnetization ant…
Nonvolatile magneto-thermal switching driven by vortex trapping in commercial In-Sn solder
Poonam Rani, Takumi Murakami, Yuto Watanabe +4
Magneto-thermal switching (MTS) is a key technology for efficient thermal management. Recently, large MTS with nonvolatility has been observed in Sn-Pb solders [H. Arima et al., Co…
Superconducting properties and electronic structure of CuAl2-type transition-metal zirconide Fe1-xNixZr2
Ryunosuke Shimada, Yuto Watanabe, Lorenzo Tortora +8
CuAl2-type transition-metal (Tr) zirconides are superconductor family, and the Tr-site element substitution largely modifies its transition temperature (Tc). Here, we synthesized p…
Large self-heating by trapped-flux reduction in Sn-Pb solders
Yoshikazu Mizuguchi, Takumi Murakami, Md. Riad Kasem +1
Magnetic flux trapping in field-cooled (FC) Sn-Pb solders has been recently studied because of the observation of nonvolatile magneto-thermal switching [H. Arima et al., Commun. Ma…
Vortex formation and exotic superconducting states in field-cooled Sn-Pb solders
Takumi Murakami, Md. Riad Kasem, Hiroto Arima +3
Formation of vortices is a typical phenomenon of type-II superconductors under magnetic fields (H). In contrast, type-I superconductors do not host vortices because of their Meissn…
Magnetic field hysteresis of thermal conductivity in type-I and typy-II superconductors
Hiroto Arima, Miku Yoshida, Yoshikazu Mizuguchi
This study investigated the magnetic field () dependence of thermal conductivity () in type I (Pb) and type II (Nb) superconductors. The of Nb displayed hysteresis, showi…
Effect of annealing in eutectic high-entropy alloy superconductor NbScTiZr
Takeru Seki, Hiroto Arima, Yuta Kawasaki +3
We investigated the impact of annealing on the structural characteristics and superconducting critical temperature () of the eutectic high-entropy alloy (HEA) superco…
Pressure-induced volumetric negative thermal expansion in CoZr2 superconductor
Yuto Watanabe, Hiroto Arima, Saori Kawaguchi-Imada +10
We investigate the thermal expansion and superconducting properties of a CuAl2-type (tetragonal) superconductor CoZr2 under high pressures. We perform high-pressure synchrotron X-r…
Anomalous Field-Temperature Phase Diagram of Superconductivity in Sn-Pb Solder
Takumi Murakami, Hiroto Arima, Yoshikazu Mizuguchi
Sn-Pb solders are superconducting materials whose Sn and Pb are perfectly phase-separated. Recently, anomalous magnetic-flux trapping in a Sn45-Pb55 solder has been revealed where…
Nonvolatile Magneto-Thermal Switching in MgB2
Hiroto Arima, Yoshikazu Mizuguchi
Ongoing research explores thermal switching materials to control heat flow. Specifically, there has been interest in magneto-thermal switching (MTS) materials based on superconduct…
Observation of nonvolatile magneto-thermal switching in superconductors
Hiroto Arima, Md. Riad Kasem, Hossein Sepehri-Amin +5
Applying a magnetic field to a solid changes its thermal-transport properties. Although such magneto-thermal-transport phenomena are usually small effects, giant magneto-thermal re…
Superconductivity in In-doped AgPbBiTe3 compounds synthesized by high-pressure synthesis
Takahiro Sawahara, Hiroto Arima, Takayoshi Katase +3
NaCl-type metal tellurides (MTe) have been widely studied due to unique physical properties. We investigated the In-doping effects on structural and physical properties of Na-Cl ty…
Large magneto-thermal-switching ratio in superconducting Pb wires
Miku Yoshida, Hiroto Arima, Aichi Yamashita +2
Thermal switching by magnetic fields is one of the important functionalities in thermal management technologies. In low-temperature devices, superconducting states can be used as a…
Uniaxial negative thermal expansion in an orthorhombic superconductor CoZr3
Hiroto Arima, Tatsuki Inui, Aichi Yamashita +5
We investigated the temperature evolution of crystal structure of orthorhombic CoZr3, which is a superconductor with a transition temperature of 4.3 K, by synchrotron and laborator…
Sign change in c-axis thermal expansion and lattice collapse by Ni substitution in Co1-xNixZr2 superconductors
Yuto Watanabe, Hiroto Arima, Hidetomo Usui +1
We investigated the structural, electronic, and superconducting properties of Co1-xNixZr2, in which c-axis thermal expansion is systematically controlled. At x (smaller than) 0.3,…
Weak antilocalization induced by Se substitution in layered BiCh-based (Ch = S, Se) superconductors LaOFBiSSe
Kazuhisa Hoshi, Hiroto Arima, Noriyuki Kataoka +6
We report transport properties for layered BiCh2-based (Ch = S, Se) superconductors LaO1-xFxBiS2-ySey (x = 0.2, 0.5, y = 0-1.05) and the observation of weak antilocalization (WAL).…
Axis thermal expansion switching in transition-metal zirconides TrZr2 by tuning the c/a ratio
Hiroto Arima, Md. Riad Kasem, Yoshikazu Mizuguchi
This study examines the temperature-dependent evolution of the lattice constants for various CuAl2-type compounds, including NiZr2, (Co,Rh,Ir)Zr2, (Fe,Co,Rh,Ir)Zr2, and (Co,Ni,Cu,R…
Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2
Md. Riad Kasem, Hiroto Arima, Yoichi Ikeda +2
We synthesized a new high-entropy-alloy-type (HEA-type) superconductor (Fe,Co,Ni,Cu,Ga)Zr2 with a Tc of 2.9 K. The EDX analyses revealed that the actual composition of the transiti…
Pressure tuning of localization and superconductivity in LaOPbBiS and LaOBiAgS
Y. Yuan, H. Arima, M. Masaoka +5
We report the effect of pressure on the electrical transport properties of the four-layer-type bismuth chalcogenide semiconductors LaOPbBiS and LaOBiAgS$_{6…
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…
Hybridization-gap Formation and Superconductivity in the Pressure-induced Semimetallic Phase of the Excitonic Insulator TaNiSe
Kazuyuki Matsubayashi, Hidekazu Okamura, Takashi Mizokawa +19
The excitonic insulator TaNiSe experiences a first-order structural transition under pressure from rippled to flat layer-structure at Ps = 3 GPa, which drives the system fr…