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61 papers
Ideal band structures for high-performance thermoelectric materials with band convergence
Yuya Hattori, Hidetomo Usui, Yoshikazu Mizuguchi
We investigate optimal band structures in band-converged systems to achieve high zT using numerical calculations based on a virtual spectral conductivity model. We consider a two p…
Theoretical study of the crystal structure of the bilayer nickel oxychloride SrNiOCl and analysis of possible unconventional superconductivity
Masayuki Ochi, Hirofumi Sakakibara, Hidetomo Usui +1
The discovery of superconductivity under high pressure with exceeding 80 K in a bilayer nickelate LaNiO has led to a strong desire to realize similar high p…
Theoretical study on the possibility of high s-wave superconductivity in the heavily hole-doped infinite layer nickelates
Hirofumi Sakakibara, Ryota Mizuno, Masayuki Ochi +2
We theoretically propose a possibility of realizing high superconductivity having -wave symmetry in the heavily hole-doped infinite layer nickelates LaSrNiO…
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…
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,…
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…