Strain-mediated insulator-metal transition in topotactically hydro-reduced SrFeO_(2)

作     者：Shuang Chen Jiali Zhao Qiao Jin Shan Lin Shengru Chen Hongbao Yao Jiaou Wang Zhen Fan Er-Jia Guo Haizhong Guo Shuang Chen;Jiali Zhao;Qiao Jin;Shan Lin;Shengru Chen;Hongbao Yao;Jiaou Wang;Zhen Fan;Er-Jia Guo;Haizhong Guo

作者机构：School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Optical Information Materials and TechnologySouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Songshan Lake Materials LaboratoryDongguan 523808China Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Collaborative Innovation Center of Light Manipulations and ApplicationsShandong Normal UniversityJinan 250358China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2021年第64卷第8期

页      面：114-119页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the National Key Basic Research Program of China(Grant Nos.2020YFA0309100,and 2019YFA0308500) the Program for the Innovation Team of Science and Technology in University of Henan(Grant No.20IRTSTHN014) the Excellent Youth Foundation of He’nan Scientific Committee(Grant No.202300410356) the National Natural Science Foundation of China(Grant No.11974390) the Beijing Nova Program of Science and Technology(Grant No.Z191100001119112) the Beijing Natural Science Foundation(Grant No.2202060) the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB33030200) 

主　　题：ferrite hydrogenation insulator-metal transition infinite layers electronic states 

摘      要：Controlling oxygen redox reactions in transition metal oxides offers an attractive route to tune their physical properties;a topotactic structural transformation from their parent phases effectively modifies the electronic state. In this work, infinitelayered SrFeO_(2) thin films were produced from brownmillerite SrFeO_(2.5) via low-temperature hydro-reduction. After the structural transition, their out-of-plane lattice constants dramatically shrank by 12%;tensilely strained samples exhibited metallic character, whereas the compressively strained ones maintained the insulating behavior of their bulk form. According to X-ray linear dichroism results, this strain-mediated electronic anisotropy may be attributed to electron redistribution within degenerated orbitals. This suggests a possible mechanism for the metallic conductivity of infinite-layered SrFeO_(2), giving a hint for understanding emergent quantum phenomena, such as the recently discovered superconductivity in nickelates, and stimulating various applications, including in ionic conductivity and oxygen catalysis.