75 citations · 579 across the 54 of their papers we have counts for
54 papers
Uniaxial negative thermal expansion in a weak-itinerant-ferromagnetic phase of CoZrH
Yuto Watanabe, Kota Suzuki, Takayoshi Katase +3
We discovered unique uniaxial negative thermal expansion (NTE) behavior for a weak-itinerant-ferromagnetic phase of CoZrH. CoZr is known as a superconductor ex…
Huge anisotropic magneto-thermal switching in high-purity polycrystalline compensated metals
Poonam Rani, Yuto Watanabe, Takuma Shiga +6
Magneto-thermal transport is a promising physical property for thermal management applications. Magneto-thermal switching enables active control of heat flows, and a high switching…
Topology meets time-reversal symmetry breaking in FeSeTe superconductor
M. Roppongi, Y. Cai, K. Ogawa +21
Time-reversal symmetry breaking (TRSB) in magnetic topological insulators induces a Dirac gap in the topological surface state (TSS), leading to exotic phenomena such as the quantu…
Investigation of superconducting gap of high-entropy telluride AgInSnPbBiTe5
Asato Seshita, Hirotaka Okabe, Riad Kasem +9
We performed transverse-field muon spin relaxation/rotation (TF-μSR) on a high-entropy-type (HE-type) superconductor AgInSnPbBiTe5. The emergence of bulk superconducting states was…
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…
Influence of trapped magnetic field of Sn-Pb solders on electrical resistivity measurement: an example of superconducting transition of Sn
Takumi Ichikawa, Yuto Watanabe, Takumi Murakami +3
We examined the affection of the flux-trapped states of Sn60-Pb40 solders on superconducting properties of a Sn wire. The temperature dependence of electrical resistivity at H = 0…
Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system Zr ( = Fe and CoNi)
Yuto Watanabe, Ceren Tayran, Md. Riad Kasem +4
Recently, huge uniaxial negative thermal expansion (NTE) along a -axis has been observed in transition-metal () zirconides Zr with a tetragonal CuAl-type str…
High entropy effect on thermoelectric properties of nonequilibrium cubic phase of AgBiSe2-2xSxTex with x = 0-0.6
Asato Seshita, Aichi Yamashita, Takayoshi Katase +1
Silver bismuth diselenide (AgBiSe2) has much attention as an efficient thermoelectric material due to its low thermal conductivity. However, AgBiSe2 exhibits multiple crystal struc…
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…
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…
Stabilization and high thermoelectric performance of high-entropy-type cubic AgBi(S, Se, Te)2
Asato Seshita, Aichi Yamashita, Takeshi Fujita +6
As thermoelectric generators can convert waste heat into electricity, they play an important role in energy harvesting. The metal chalcogenide AgBiSe2 is one of the high-performanc…
Observation of superconductivity and enhanced upper critical field of -carbide-type oxide ZrPdO
Yuto Watanabe, Akira Miura, Chikako Moriyoshi +2
We report the first observation of bulk superconductivity of a -carbide-type oxide ZrPdO. The crystal structure and the superconducting properties were studied throu…
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…
Absence of Tc-Pinning Phenomenon Under High Pressure in High-Entropy REO0.5F0.5BiS2 Layered Superconductor
Yoshikazu Mizuguchi, Kazuki Yamane, Ryo Matsumoto +7
Recently, robustness of superconductivity (transition temperature, Tc) under high pressures has been observed in high-entropy alloy (HEA), bcc-type Ti-Zr-Hf-Nb-Ta, and HEA-type com…
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…
Magneto-thermal-switching properties of superconducting Nb
Miku Yoshida, Md. Riad Kasem, Aichi Yamashita +2
Recently, thermal switching has been extensively studied because it is a key component for thermal management in electronic devices. Here, we show a huge magneto-thermal-switching…
Synthesis and physical properties of (Pb0.5M0.5)(Sr,La)2CuOz (z~5; M = Fe, Co, Cu, and Zn)
Takumi Nakano, Toshihiko Maeda, Takeshi Fujita +1
(Pb0.5Cu0.5)(Sr0.5La0.5)2CuOz (abbreviated as (Pb,Cu)-"1-2-0-1") with superconducting transition temperature (Tc) of 25 K is a member (n = 1) of one of the homologous series of cup…
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…
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).…
Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors
Yoshikazu Mizuguchi, Hidetomo Usui, Rei Kurita +10
The motivation of this work is our recent observation of the robustness of superconductivity in a High-entropy (HE) superconductor Ag0.2In0.2Sn0.2Pb0.2Bi0.2Te (CsCl-type) to extern…
Estimation of Grüneisen Parameter of Layered Superconductor LaO0.5F0.5BiS2-xSex (x = 0.2, 0.4, 0.6, 0.8, 1.0)
Fysol Ibna Abbas, Kazuhisa Hoshi, Yuki Nakahira +7
The superconducting properties and structural parameters, including the Grüneisen parameter (γG), of the BiCh2-based (Ch: S, Se) layered superconductor LaO0.5F0.5BiS2-xSex were inv…
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…
Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
Fysol Ibna Abbas, Kazuhisa Hoshi, Aichi Yamashita +9
We studied Grüneisen parameter (γG) to investigate lattice anharmonicity in a layered BiS2-based superconductor system REO1-xFxBiS2 (RE = La, Ce, Pr, Nd), where in-plane chemical p…