Drastic enhancement of magnetic critical temperature and amorphization in topological magnet EuSn2P2 under pressure
Drastic enhancement of magnetic critical temperature and amorphization in topological magnet EuSn2P2 under pressure
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DOI：
10.1038/s41535-022-00451-9
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发表时间：
2022-04
影响因子：
5.7
通讯作者：
W. Bi;Trenton Culverhouse;Zachary Nix;W. Xie;Hung-Ju Tien;T. Chang;U. Dutta;Jiyong Zhao;
中科院分区：
文献类型：
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作者：
W. Bi;Trenton Culverhouse;Zachary Nix;W. Xie;Hung-Ju Tien;T. Chang;U. Dutta;Jiyong Zhao;
高压是通过控制磁序和拓扑态的相互作用在磁拓扑绝缘体中诱发奇异量子现象的有效工具。这项工作对本征拓扑磁体 EuSn2P2 中的晶体结构和高达 62 GPa 的磁性基态进行了全面的高压研究。结合高分辨率X射线衍射、151Eu同步加速器穆斯堡尔谱、X射线吸收光谱、分子轨道计算和电子能带结构计算，揭示了压力在36GPa下将EuSn2P2从菱面体晶体转变为非晶相，同时磁有序温度提高了四倍。在压力诱导的非晶相中，Eu 离子呈中间价态。 Ruderman-Kittel-Kasuya-Yosida (RKKY) 相互作用导致磁有序温度从环境压力下的 30 K 急剧提高到 41.2GPa 下的 130 K，这可能归因于高压下更强的 Eu-Sn 相互作用。这些丰富的结果表明，EuSn2P2是研究增强的RKKY相互作用、无序晶格、中间价态和拓扑态的相关性的理想平台。
High pressure is an effective tool to induce exotic quantum phenomena in magnetic topological insulators by controlling the interplay of magnetic order and topological state. This work presents a comprehensive high-pressure study of the crystal structure and magnetic ground state up to 62 GPa in an intrinsic topological magnet EuSn2P2. With a combination of high resolution X-ray diffraction,151Eu synchrotron Mössbauer spectroscopy, X-ray absorption spectroscopy, molecular orbital calculations, and electronic band structure calculations, it has been revealed that pressure drives EuSn2P2from a rhombohedral crystal to an amorphous phase at 36 GPa accompanied by a fourfold enhancement of magnetic ordering temperature. In the pressure-induced amorphous phase, Eu ions take an intermediate valence state. The drastic enhancement of magnetic ordering temperature from 30 K at ambient pressure to 130 K at 41.2 GPa resulting from Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions likely attributes to the stronger Eu–Sn interaction at high pressure. These rich results demonstrate that EuSn2P2is an ideal platform to study the correlation of the enhanced RKKY interactions, disordered lattice, intermediate valence, and topological state.