期刊
CHINESE PHYSICS LETTERS
卷 37, 期 10, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/37/10/107401
关键词
74; 70; -b; 81; 40; Vw; 62; 50; -p; 88; 30; rd
资金
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB33000000, XDB25000000]
- Beijing Natural Science Foundation [Z190008]
- National Natural Science Foundation of China [11575288, 11921004, 11888101, 11904391, 11834016, 11874400]
- National Key R&D Program of China [2016YFA0401503, 2018YFA0305700]
- Youth Innovation Promotion Association
- Key Research Program of Frontier Sciences
- Interdisciplinary Innovation Team of Chinese Academy of Sciences [2016006, JCTD-2019-01, QYZDBSSW-SLH013]
Recently, the theoretically predicted lanthanum superhydride, LaH10 +/-delta, with a clathrate-like structure was successfully synthesized and found to exhibit a record high superconducting transition temperatureT(c)approximate to 250 K at similar to 170 GPa, opening a new route for room-temperature superconductivity. However, sincein situexperiments at megabar pressures are very challenging, few groups have reported the similar to 250 K superconducting transition in LaH10 +/-delta. Here, we establish a simpler sample-loading procedure that allows a relatively large sample size for synthesis and a standard four-probe configuration for resistance measurements. Following this procedure, we successfully synthesized LaH(10 +/-delta)with dimensions up to 10 x 20 mu m(2)by laser heating a thin La flake and ammonia borane at similar to 1700 K in a symmetric diamond anvil cell under the pressure of 165 GPa. The superconducting transition atT(c)approximate to 250 K was confirmed through resistance measurements under various magnetic fields. Our method will facilitate explorations of near-room-temperature superconductors among metal superhydrides.
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