Pressure-induced high-temperature superconductivity retained without pressure in FeSe single crystals

Liangzi Deng, Trevor Bontke, Rabin Dahal, Yu Xie, Bin Gao, Xue Li, Ketao Yin, Melissa Gooch, Donald Rolston, Tong Chen, Zheng Wu, Yanming Ma, Pengcheng Dai, Ching Wu Chu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

To raise the superconducting-transition temperature (Tc) has been the driving force for the long-sustained effort in superconductivity research. Recent progress in hydrides with Tcs up to 287 K under pressure of 267 GPa has heralded a new era of room temperature superconductivity (RTS) with immense technological promise. Indeed, RTS will lift the temperature barrier for the ubiquitous application of superconductivity. Unfortunately, formidable pressure is required to attain such high Tcs. The most effective relief to this impasse is to remove the pressure needed while retaining the pressure-induced Tc without pressure. Here, we show such a possibility in the pure and doped high-temperature superconductor (HTS) FeSe by retaining, at ambient pressure via pressure quenching (PQ), its Tc up to 37 K (quadrupling that of a pristine FeSe at ambient) and other pressureinduced phases. We have also observed that some phases remain stablewithout pressure at up to 300 K and for at least 7 d. The observations are in qualitative agreement with our ab initio simulations using the solid-state nudged elastic band (SSNEB) method. We strongly believe that the PQ technique developed here can be adapted to the RTS hydrides and other materials of value with minimal effort.

Original languageEnglish
Article numbere2108938118
JournalProceedings of the National Academy of Sciences of the United States of America
Volume118
Issue number28
DOIs
Publication statusPublished - 2021 Jul 13

All Science Journal Classification (ASJC) codes

  • General

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