Abstract
In this paper, the electron-phonon coupling (EPC) properties of topological material NaSnSb has been explored, whose low phonon branch dominates the EPC constant λ. NaSnSb can remain the strength of its EPC with a slight compression of the distance of the Na and Sb atoms along the z-axis (z Na–Sb), while further compression or stretching would destroy the strength of its EPC. By pressing, in the pressure range of 2 GPa, the superconducting transition temperature (T c) of NaSnSb behaves similar to that of FeSe in the same pressure range, with a local minimum at 1 GPa and a maximum at 1.5 GPa. Both compressing z Na–Sb and pressure lead to phonon softening of NaSnSb. The phonon softening induced by compressing z Na–Sb is three-dimensional, whereas the phonon softening induced by compression is two-dimensional.
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