Synthesis and superconductivity in yttrium-cerium hydrides at high pressures

Year: 2024

Authors: Chen LC., Luo T., Cao ZY., Dalladay-Simpson P., Huang G., Peng D., Zhang LL., Gorelli FA., Zhong GH., Lin HQ., Chen XJ.

Autors Affiliation: Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China; Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China; Sungkyunkwan Univ, Ctr Quantum Mat & Superconduct CQMS, Suwon 16419, South Korea; Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea; Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China; CNR, Natl Inst Opt INO, Via N Carrara 1, I-50019 Florence, Italy; European Lab Nonlinear Spect LENS, Via N Carrara 1, I-50019 Florence, Italy; Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China; Univ Chinese Acad Sci, Beijing 100049, Peoples R China; Zhejiang Univ, Sch Phys, Hangzhou 310058, Peoples R China; Univ Houston, Dept Phys, Houston, TX 77204 USA; Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.

Abstract: Further increasing the critical temperature and/or decreasing the stabilized pressure are the general hopes for the hydride superconductors. Inspired by the low stabilized pressure associated with Ce 4f electrons in superconducting cerium superhydride and the high critical temperature in yttrium superhydride, we carry out seven independent runs to synthesize yttrium-cerium alloy hydrides. The synthetic process is examined by the Raman scattering and X-ray diffraction measurements. The superconductivity is obtained from the observed zero-resistance state with the detected onset critical temperatures in the range of 97-141 K. The upper critical field towards 0 K at pressure of 124 GPa is determined to be between 56 and 78 T by extrapolation of the results of the electrical transport measurements at applied magnetic fields. The analysis of the structural data and theoretical calculations suggest that the phase of Y0.5Ce0.5H9 in hexagonal structure with the space group of P63/mmc is stable in the studied pressure range. These results indicate that alloying superhydrides indeed can maintain relatively high critical temperature at relatively modest pressures accessible by laboratory conditions.

Journal/Review: NATURE COMMUNICATIONS

Volume: 15 (1)      Pages from: 1809-1  to: 1809-7

More Information: The work was supported by the Basic Research Program of Shenzhen (Grant No. JCYJ20200109112810241), the Shenzhen Science and Technology Program (Grant Nos. KQTD20200820113045081 and RCBS20221008093127072), the National Post-doctoral Program for Innovative Talents (Grant No. BX2021091), and the National Key R&D Program of China (Grant No. 2018YFA0305900).
KeyWords: Hydrogen; Temperature; Transitions; Lanthanum; Dynamics
DOI: 10.1038/s41467-024-46133-x

Citations: 11
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24
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