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.
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)
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)。