Observation of superconductivity and its enhancement at the charge density wave critical point in LaAgSb2
arxiv(2022)
摘要
We discover superconductivity (SC) in LaAgSb2 at ambient pressure and its close correlation with a charge density wave (CDW) under pressure. The superconducting transition temperature (Tc) exhibits a sharp peak at a CDW critical pressure of 3.2 GPa. We demonstrate that the carriers inhabiting the Sb-square net are crucial not only in the formation of CDW but also in SC for their relatively strong electron-phonon coupling (EPC). Furthermore, theoretical EPC strength in pristine LaAgSb2 cannot explain the observed peak with Tc - 1 K, which indicates that an additional mechanism reinforces SC only around the CDW critical pressure.
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关键词
superconductivity,critical point,density wave
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