journal article·2024-11

Pressure‐Induced Re‐Entrant Superconductivity in Transition Metal Dichalcogenide TiSe 2

Wei Xia, Jiaxuan Wu, Chengliang Xia, Zhongyang Li, Jian Yuan, Chao An, Xiangqi Liu, Xia Wang, Na Yu, Zhiqiang Zou, Gang Liu, Jiajia Feng, Lili Zhang, Zhaohui Dong, Bin Chen, Zhaorong Yang, Zhenhai Yu, Hanghui Chen, Yanfeng Guo

Small· Volume 20· Issue 45
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Abstract

Abstract Transition metal dichalcogenide TiSe 2 exhibits a superconducting dome within a low pressure range of 2–4 GPa, which peaks with the maximal transition temperature T c of ≈1.8 K. Here it is reported that applying high pressure induces a new superconducting state in TiSe 2 , which starts at ≈16 GPa with a substantially higher T c that reaches 5.6 K at ≈21.5 GPa with no sign of decline. Combining high‐throughput first‐principles structure search, X‐ray diffraction, and Raman spectroscopy measurements up to 30 GPa, It is found that TiSe 2 undergoes a first‐order structural transition from the 1 T phase under ambient pressure to a new 4 O phase under high pressure. Comparative ab initio calculations reveal that while the conventional phonon‐mediated pairing mechanism may account for the superconductivity observed in 1 T ‐TiSe 2 under low pressure, the electron‐phonon coupling of 4 O ‐TiSe 2 is too weak to induce a superconducting state whose transition temperature is as high as 5.6 K under high pressure. The new superconducting state found in pressurized TiSe 2 requires further study on its underlying mechanism.
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Research context

OpenAlex topics: Iron-based superconductors research · 2D Materials and Applications · Inorganic Chemistry and Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 201210 China

NYU‐ECNU Institute of Physics NYU Shanghai Shanghai 200122 China

Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China

Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China

Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China

Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 China

Department of Physics New York University New York 10012 USA

Funding

National Key Research and Development Program of China · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China · Science and Technology Innovation Plan Of Shanghai Science and Technology Commission · Key Technologies Research and Development Program

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