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Wuhao Chen, Dmitrii V. Semenok, Xiaoli Huang, Haiyun Shu, Xin Li, Defang Duan, Tian Cui, Артем Ромаевич Оганов
The discoveries of high-temperature superconductivity in ${\mathrm{H}}_{3}\mathrm{S}$ and ${\mathrm{LaH}}_{10}$ have excited the search for superconductivity in compressed hydrides, finally leading to the first discovery of a room-temperature superconductor in a carbonaceous sulfur hydride. In contrast to rapidly expanding theoretical studies, high-pressure experiments on hydride superconductors are expensive and technically challenging. Here, we experimentally discovered superconductivity in two new phases, $Fm\overline{3}m\text{\ensuremath{-}}{\mathrm{CeH}}_{10}$ (SC-I phase) and $P{6}_{3}/mmc\text{\ensuremath{-}}{\mathrm{CeH}}_{9}$ (SC-II phase) at pressures that are much lower ($<100\text{ }\text{ }\mathrm{GPa}$) than those needed to stabilize other polyhydride superconductors. Superconductivity was evidenced by a sharp drop of the electrical resistance to zero and decreased critical temperature in deuterated samples and in external magnetic field. SC-I has ${T}_{c}=115\text{ }\text{ }\mathrm{K}$ at 95 GPa, showing an expected decrease in further compression due to the decrease of the electron-phonon coupling (EPC) coefficient $\ensuremath{\lambda}$ (from 2.0 at 100 GPa to 0.8 at 200 GPa). SC-II has ${T}_{c}=57\text{ }\text{ }\mathrm{K}$ at 88 GPa, rapidly increasing to a maximum ${T}_{c}\ensuremath{\sim}100\text{ }\text{ }\mathrm{K}$ at 130 GPa, and then decreasing in further compression. According to the theoretical calculation, this is due to a maximum of $\ensuremath{\lambda}$ at the phase transition from $P{6}_{3}/mmc\text{\ensuremath{-}}{\mathrm{CeH}}_{9}$ into a symmetry-broken modification $C2/c\text{\ensuremath{-}}{\mathrm{CeH}}_{9}$. The pressure-temperature conditions of synthesis affect the actual hydrogen content and the actual value of ${T}_{c}$. Anomalously low pressures of stability of cerium superhydrides make them appealing for studies of superhydrides and for designing new superhydrides with stability at even lower pressures.
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Chen, W., Semenok, D. V., Huang, X., Shu, H., Li, X., Duan, D., Cui, T., & Оганов, А. Р. (2021). High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar. Physical Review Letters, 127(11), 117001. https://doi.org/10.1103/physrevlett.127.117001
Chen, Wuhao, et al. "High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar." Physical Review Letters, vol. 127, no. 11, 2021, pp. 117001, https://doi.org/10.1103/physrevlett.127.117001.
Chen, Wuhao, Dmitrii V. Semenok, Xiaoli Huang, Haiyun Shu, Xin Li, Defang Duan, Tian Cui, and Артем Ромаевич Оганов. "High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar." Physical Review Letters 127, no. 11 (2021): 117001. https://doi.org/10.1103/physrevlett.127.117001.
Chen W., Semenok D. V., Huang X. [и др.] High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar // Physical Review Letters. — 2021. — Vol. 127, № 11. — P. 117001. — URL: https://doi.org/10.1103/physrevlett.127.117001
@article{chen2021hightemperature,
title = {{High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar}},
author = {Wuhao Chen and Dmitrii V. Semenok and Xiaoli Huang and Haiyun Shu and Xin Li and Defang Duan and Tian Cui and Артем Ромаевич Оганов},
journal = {Physical Review Letters},
year = {2021},
volume = {127},
number = {11},
pages = {117001},
doi = {10.1103/physrevlett.127.117001},
url = {https://doi.org/10.1103/physrevlett.127.117001}
}TY - JOUR AU - Chen, Wuhao AU - Semenok, Dmitrii V. AU - Huang, Xiaoli AU - Shu, Haiyun AU - Li, Xin AU - Duan, Defang AU - Cui, Tian AU - Оганов, Артем Ромаевич TI - High-Temperature Superconducting Phases in Cerium Superhydride with a T c up to 115 K below a Pressure of 1 Megabar JO - Physical Review Letters VL - 127 IS - 11 SP - 117001 PY - 2021 DA - 2021/09/09 DO - 10.1103/physrevlett.127.117001 UR - https://doi.org/10.1103/physrevlett.127.117001 ER -
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