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arXiv · 2305.15619

Phonon-mediated superconductivity in the Sb-square-net compound LaCuSb$_2$

Kazuto Akiba·Tatsuo C. Kobayashi
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Abstract

We investigated the electronic structure and superconducting properties of single-crystalline LaCuSb$_2$. The resistivity, magnetization, and specific heat measurements showed that LaCuSb$_2$ is a bulk superconductor. The observed Shubnikov-de Haas oscillation and magnetic field dependence of the Hall resistivity can be reasonably understood assuming a slightly hole-doped Fermi surface. Electron-phonon coupling calculation clarified the difference from the isostructural compound LaAgSb$_2$ indicating that (i) low-frequency vibration modes related to the interstitial layer sandwiched between the Sb-square nets significantly contribute to the superconductivity and (ii) carriers with sizable electron--phonon coupling distribute isotropically on the Fermi surface. These are assumed to be the origin of higher superconducting transition temperature compared with LaAgSb$_2$. We conclude that the superconducting properties of LaCuSb$_2$ can be understood within the framework of conventional phonon-mediated mechanism.

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Kazuto Akiba, Tatsuo C. Kobayashi. 2023-05-24. Phonon-mediated superconductivity in the Sb-square-net compound LaCuSb$_2$. https://doi.org/10.1103/physrevb.107.245117

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