Transformation of Hexagonal Lu to Cubic LuH$_{2+x}$ Single-Crystalline Films

doi:10.1088/0256-307X/40/8/087401

Chin. Phys. Lett.

2023, Vol. 40

Issue (8): 087401 DOI: 10.1088/0256-307X/40/8/087401

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Transformation of Hexagonal Lu to Cubic LuH$_{2+x}$ Single-Crystalline Films

Peiyi Li^1,2†, Jiachang Bi^2†, Shunda Zhang², Rui Cai^1,2, Guanhua Su², Fugang Qi^1,2, Ruyi Zhang², Zhiyang Wei^2,3, and Yanwei Cao^2,3*

¹School of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
²Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
³Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Cite this article:

Peiyi Li, Jiachang Bi, Shunda Zhang et al 2023 Chin. Phys. Lett. 40 087401

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Abstract With the recent report of near ambient superconductivity at room temperature in the N-doped lutetium hydride (Lu–H–N) system, the understanding of cubic Lu–H compounds has attracted worldwide attention. Generally, compared to polycrystals with non-negligible impurities, the single-crystalline form of materials with high purity can provide an opportunity to show their hidden properties. However, the experimental synthesis of single-crystalline cubic Lu–H compounds has not been reported so far. Here, we develop an easy way to synthesize highly pure LuH$_{2+x}$ single-crystalline films by the post-annealing of Lu single-crystalline films (purity of 99.99%) in H$_2$ atmosphere. The crystal and electronic structures of films were characterized by x-ray diffraction, Raman spectroscopy, and electrical transport. Interestingly, Lu films are silver-white and metallic, whereas their transformed LuH$_{2+x}$ films become purple-red and insulating, indicating the possible formation of an unreported electronic state of Lu–H compounds. Our work provides a novel route to synthesize and explore more single-crystalline Lu–H compounds.

Received: 16 April 2023 Published: 24 July 2023

PACS:	74.25.-q	(Properties of superconductors)
	74.78.-w	(Superconducting films and low-dimensional structures)
	73.20.-r	(Electron states at surfaces and interfaces)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/40/8/087401 OR https://cpl.iphy.ac.cn/Y2023/V40/I8/087401

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	Peiyi Li
	Jiachang Bi
	Shunda Zhang
	Rui Cai
	Guanhua Su
	Fugang Qi
	Ruyi Zhang
	Zhiyang Wei
	and Yanwei Cao

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