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

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.

arXiv comment23 pages, 9 figures

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