# Superconductivity above 200 K discovered in superhydrides of calcium

“Superconductivity above 200 K discovered in superhydrides of calcium” (2022), by Zhiwen Li et al. Earth and Planetary Sciences research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: Zhiwen Li, Xin He, Changling Zhang, Xiancheng Wang, Sijia Zhang, Yating Jia, Shaomin Feng, Ke Lu, Jianfa Zhao, Jun Zhang et al.
- Published: May 23, 2022
- Field: Earth and Planetary Sciences
- DOI: https://doi.org/10.1038/s41467-022-30454-w
- Free PDF: https://www.nature.com/articles/s41467-022-30454-w.pdf

## Abstract

Searching for superconductivity with Tc near room temperature is of great interest both for fundamental science & potential applications. Here we report the experimental discovery of superconductivity with maximum critical temperature(Tc) above 210 K in calcium superhydrides, the third type hydride experimentally showing superconductivity above 200K in addition to sulfur hydride & rare earth hydride system. The materials are synthesized at the synergetic conditions of 160~190 GPa and ~2000K using diamond anvil cell combined with in-situ laser heating technique. The superconductivity was studied through in situ high pressure resistance measurements in applied magnetic field for the sample quenched from high temperature while maintained at the synthesized pressure. The upper critical field was estimated to be ~268T while the GL coherent length is ~11 Å. The in situ x ray diffractions with synchrotron suggest that the synthesized calcium hydrides are primarily composed of CaH6 while there also exist other calcium hydrids with different hydrogen.

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