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Phase diagram of thin films of lutetium hydride—lutetium |
| Haofeng Chen(陈浩锋)1,2,†, Xin Yang(杨鑫)1,2,†, and Lixin Cao(曹立新)1,2,‡ |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Lutetium hydrides LuH$_x$ thin films with $x$ from 0 up to 3.2 were deposited on Si(001) substrates by laser ablating a 4N lutetium metal target in a vacuum or hydrogen environment. With $x$ increasing, the hydride films undergo a phase transition at $x \sim 0.77$ from hexagonal close-packed (hcp) to face-centered cubic (fcc) structures. The anomaly was found to emerge in temperature-dependent resistivity at $\sim 173$ K in hcp-phase films but not in fcc-phase films. The sudden dramatic decrease in the amplitude of the anomaly once hydride enters the two-phase region from the hcp-phase side supports the idea that the formation of the hydrogen network in the $a$-$b$ plane of the hcp-phase is the sole reason for the emergence of the anomaly.
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Received: 12 January 2026
Revised: 13 February 2026
Accepted manuscript online: 23 February 2026
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PACS:
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73.61.At
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(Metal and metallic alloys)
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68.55.Nq
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(Composition and phase identification)
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71.20.Eh
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(Rare earth metals and alloys)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFB3507303 and 2022YFF0706102). |
Corresponding Authors:
Lixin Cao
E-mail: lxcao@iphy.ac.cn
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Cite this article:
Haofeng Chen(陈浩锋), Xin Yang(杨鑫), and Lixin Cao(曹立新) Phase diagram of thin films of lutetium hydride—lutetium 2026 Chin. Phys. B 35 057303
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