Synthesis of superconducting phase of La0.5Ce0.5H10 at high pressures

Year: 2024

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

Autors Affiliation: Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China; Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, HFIPS, Hefei 230031, Peoples R China; Univ Sci & Technol China, Hefei 230026, Peoples R China; Univ Sci & Technol China, Sch Sci, Hefei 230026, Peoples R China; Sungkyunkwan Univ, Ctr Quantum Mat & Superconduct CQMS, Suwon 16419, South Korea; Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea; Natl Inst Opt INO CNR, Via N Carrara 1, I-50019 Sesto Fiorentino, Florence, Italy; European Lab Nonlinear Spect LENS, Via N Carrara 1, I-50019 Sesto Fiorentino, 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: Clathrate hydride Fm (3) over barm-LaH10 has been proven as the most extraordinary superconductor with the critical temperature T-c above 250 K upon compression of hundreds of GPa in recent years. A general hope is to reduce the stabilization pressure and maintain the high T-c value of the specific phase in LaH10. However, strong structural instability distorts Fm (3) over barm structure and leads to a rapid decrease of Tc at low pressures. Here, we investigate the phase stability and superconducting behaviors of Fm (3) over barm-LaH10 with enhanced chemical pre-compression through partly replacing La by Ce atoms from both experiments and calculations. For explicitly characterizing the synthesized hydride, we choose lanthanum-cerium alloy with stoichiometry composition of 1:1. X-ray diffraction and Raman scattering measurements reveal the stabilization of Fm (3) over barm-La0.5Ce0.5H10 in the pressure range of 140-160 GPa. Superconductivity with T-c of 175 +/- 2 K at 155 GPa is confirmed with the observation of the zero-resistivity state and supported by the theoretical calculations. These findings provide applicability in the future explorations for a large variety of hydrogen-rich hydrides.

Journal/Review: JOURNAL OF PHYSICS-CONDENSED MATTER

Volume: 36 (7)      Pages from: 75702-1  to: 75702-8

More Information: G H, D P, T L and L-C C contributed equally to this work. The work at HIT was supported by the Basic Research Program of Shenzhen (Grant No. JCYJ20200109112810241) and the Shenzhen Science and Technology Program (Grant No. KQTD20200820113045081). The work at HPSTAR was supported by the National Key R & D Program of China (Grant No. 2018YFA0305900). The theoretical works were supported by the National Natural Science Foundation of China (Grant Nos. 12074401 and 12088101).
KeyWords: superconductivity; hydride; La0.5Ce0.5H10; LaH10; electron-phonon coupling
DOI: 10.1088/1361-648X/ad0915

Citations: 6
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-24
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