中国物理B ›› 2026, Vol. 35 ›› Issue (5): 57303-057303.doi: 10.1088/1674-1056/ae48c7

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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. 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
  • 收稿日期:2026-01-12 修回日期:2026-02-13 接受日期:2026-02-23 发布日期:2026-05-07
  • 通讯作者: Lixin Cao E-mail:lxcao@iphy.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFB3507303 and 2022YFF0706102).

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. 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
  • Received:2026-01-12 Revised:2026-02-13 Accepted:2026-02-23 Published:2026-05-07
  • Contact: Lixin Cao E-mail:lxcao@iphy.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2023YFB3507303 and 2022YFF0706102).

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摘要： 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.

关键词: lutetium, hydride, thin film, heavy rare earth metal

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.

Key words: lutetium, hydride, thin film, heavy rare earth metal

中图分类号:  (Metal and metallic alloys)

  • 73.61.At
68.55.Nq (Composition and phase identification) 71.20.Eh (Rare earth metals and alloys)