Transformation of Hexagonal Lu to Cubic LuH_(2+x)Single-Crystalline Films  

作　　者：李沛怡 毕佳畅 张顺达 蔡瑞 苏冠华 綦福刚 张如意 魏志阳 曹彦伟 Peiyi Li;Jiachang Bi;Shunda Zhang;RuiCai;Guanhua Su;Fugang Qi;Ruyi Zhang;Zhiyang Wei;Yanwei Cao(School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

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

出　　处：《Chinese Physics Letters》2023年第8期99-102,共4页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2022YFA1403000);the National Natural Science Foundation of China(Grant Nos.U2032126,11874058);the Pioneer Hundred Talents Program of the Chinese Academy of Sciences;the Zhejiang Provincial Natural Science Foundation(Grant No.LXR22E020001);the Beijing National Laboratory for Condensed Matter Physics;the Ningbo Natural Science Foundation(Grant No.2022J292);the Ningbo Science and Technology Bureau(Grant No.2022Z086)。

摘　　要：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 singlecrystalline Lu-H compounds.

关 键 词：CRYSTALLINE PURITY CUBIC 

分 类 号：TB383.2[一般工业技术—材料科学与工程] O511[理学—低温物理]