Pressure-Induced Superconductivity and Structure Phase Transition in SnAs-Based Zintl Compound SrSn2As2

Advanced Physics Research Pub Date : 2024-03-03 DOI:10.1002/apxr.202300149

Weizheng Cao, Juefei Wu, Yongkai Li, Cuiying Pei, Qi Wang, Yi Zhao, Changhua Li, Shihao Zhu, Mingxin Zhang, Lili Zhang, Yulin Chen, Zhiwei Wang, Yanpeng Qi

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Abstract

Layered SnAs-based Zintl compounds exhibit a distinctive electronic structure, igniting extensive research efforts in areas of superconductivity, topological insulators, and quantum magnetism. In this paper, the crystal structures and electronic properties of the Zintl compound SrSn₂As₂ upon compression are systematically investigated. Pressure-induced superconductivity is observed in SrSn₂As₂ with a nonmonotonic evolution of superconducting transition temperature T_c. Theoretical calculations together with high-pressure synchrotron X-ray diffraction and Raman spectroscopy have identified that SrSn₂As₂ undergoes a structural transformation from a rhombohedral Rm phase to the monoclinic C2/m phase. Beyond 28.3 GPa, T_c is suppressed due to a reduction of the density of state (DOS) at the Fermi level. The discovery of pressure-induced superconductivity, accompanied by structural transitions in SrSn₂As₂, greatly expands the physical properties of layered SnAs-based compounds and provides new ground states upon compression.

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基于 SnAs 的锌化合物 SrSn2As2 中的压力诱导超导性和结构相变

以砷化镓为基础的层状 Zintl 化合物显示出独特的电子结构，从而引发了超导、拓扑绝缘体和量子磁学等领域的广泛研究。本文系统研究了 Zintl 化合物 SrSn2As2 压缩后的晶体结构和电子特性。在 SrSn2As2 中观察到压力诱导的超导现象，超导转变温度 Tc 呈非单调演化。理论计算以及高压同步辐射 X 射线衍射和拉曼光谱发现，SrSn2As2 经历了从斜方 Rm 相到单斜 C2/m 相的结构转变。当压力超过 28.3 GPa 时，由于费米级的状态密度（DOS）降低，Tc 会被抑制。压力诱导超导性的发现伴随着 SrSn2As2 的结构转变，极大地扩展了以砷化镓为基础的层状化合物的物理特性，并在压缩时提供了新的基态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Advanced Physics Research

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