Superconductivity Above 200 K Discovered in Superhydrides of Calcium

Overview

Journal Nat Commun

Specialty Biology

Date 2022 May 23

PMID 35606357

Authors

Zhiwen Li

Xin He

Changling Zhang

Xiancheng Wang

Sijia Zhang

Yating Jia

Shaomin Feng

Ke Lu

Jianfa Zhao

Jun Zhang

Baosen Min

Youwen Long

Richeng Yu

Luhong Wang

Meiyan Ye

Zhanshuo Zhang

Vitali Prakapenka

Stella Chariton

Paul A Ginsberg

Jay Bass

Shuhua Yuan

Haozhe Liu

Changqing Jin

Affiliations

Soon will be listed here.

Abstract

Searching for superconductivity with T near room temperature is of great interest both for fundamental science & many potential applications. Here we report the experimental discovery of superconductivity with maximum critical temperature (T) above 210 K in calcium superhydrides, the new alkali earth hydrides experimentally showing superconductivity above 200 K in addition to sulfur hydride & rare-earth hydride system. The materials are synthesized at the synergetic conditions of 160~190 GPa and ~2000 K using diamond anvil cell combined with in-situ laser heating technique. The superconductivity was studied through in-situ high pressure electric conductance measurements in an applied magnetic field for the sample quenched from high temperature while maintained at high pressures. The upper critical field Hc(0) was estimated to be ~268 T while the GL coherent length is ~11 Å. The in-situ synchrotron X-ray diffraction measurements suggest that the synthesized calcium hydrides are primarily composed of CaH while there may also exist other calcium hydrides with different hydrogen contents.

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