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Liang Ma, Kui Wang, Yu Xie, Xin Yang, Yingying Wang, Mi Zhou, Hanyu Liu, Xiaohui Yu, Yongsheng Zhao, Hongbo Wang, Guangtao Liu, Yanming Ma
The recent discovery of superconductive rare earth and actinide superhydrides has ushered in a new era of superconductivity research at high pressures. This distinct type of clathrate metal hydrides was first proposed for alkaline-earth-metal hydride CaH_{6} that, however, has long eluded experimental synthesis, impeding an understanding of pertinent physics. Here, we report successful synthesis of CaH_{6} and its measured superconducting critical temperature T_{c} of 215 K at 172 GPa, which is evidenced by a sharp drop of resistivity to zero and a characteristic decrease of T_{c} under a magnetic field up to 9 T. An estimate based on the Werthamer-Helfand-Hohenberg model gives a giant zero-temperature upper critical magnetic field of 203 T. These remarkable benchmark superconducting properties place CaH_{6} among the most outstanding high-T_{c} superhydrides, marking it as the hitherto only clathrate metal hydride outside the family of rare earth and actinide hydrides. This exceptional case raises great prospects of expanding the extraordinary class of high-T_{c} superhydrides to a broader variety of compounds that possess more diverse material features and physics characteristics.
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Ma, L., Wang, K., Xie, Y., Yang, X., Wang, Y., Zhou, M., Liu, H., Yu, X., Zhao, Y., Wang, H., Liu, G., & Ma, Y. (2022). High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa. Physical Review Letters, 128(16), 167001. https://doi.org/10.1103/physrevlett.128.167001
Ma, Liang, et al. "High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa." Physical Review Letters, vol. 128, no. 16, 2022, pp. 167001, https://doi.org/10.1103/physrevlett.128.167001.
Ma, Liang, Kui Wang, Yu Xie, Xin Yang, Yingying Wang, Mi Zhou, Hanyu Liu, et al. "High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa." Physical Review Letters 128, no. 16 (2022): 167001. https://doi.org/10.1103/physrevlett.128.167001.
Ma L., Wang K., Xie Y. [и др.] High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa // Physical Review Letters. — 2022. — Vol. 128, № 16. — P. 167001. — URL: https://doi.org/10.1103/physrevlett.128.167001
@article{ma2022hightemperature,
title = {{High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa}},
author = {Liang Ma and Kui Wang and Yu Xie and Xin Yang and Yingying Wang and Mi Zhou and Hanyu Liu and Xiaohui Yu and Yongsheng Zhao and Hongbo Wang and Guangtao Liu and Yanming Ma},
journal = {Physical Review Letters},
year = {2022},
volume = {128},
number = {16},
pages = {167001},
doi = {10.1103/physrevlett.128.167001},
url = {https://doi.org/10.1103/physrevlett.128.167001}
}TY - JOUR AU - Ma, Liang AU - Wang, Kui AU - Xie, Yu AU - Yang, Xin AU - Wang, Yingying AU - Zhou, Mi AU - Liu, Hanyu AU - Yu, Xiaohui AU - Zhao, Yongsheng AU - Wang, Hongbo AU - Liu, Guangtao AU - Ma, Yanming TI - High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH 6 up to 215 K at a Pressure of 172 GPa JO - Physical Review Letters VL - 128 IS - 16 SP - 167001 PY - 2022 DA - 2022/04/20 DO - 10.1103/physrevlett.128.167001 UR - https://doi.org/10.1103/physrevlett.128.167001 ER -
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