Momentum-space spin texture induced by strain gradient in nominally centrosymmetric SrIrO_(3)films  

作　　者：Minghui Gu Haohao Sheng Xiaofeng Wu Mei Wu Xiaoran Liu Fang Yang Zhongshan Zhang Peng Gao Zhijun Wang Meng Meng Jiandong Guo 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]International Center for Quantum Materials,and Electron Microscopy Laboratory,School of Physics,Peking University,Beijing 100091,China

出　　处：《National Science Review》2024年第10期228-236,共9页国家科学评论（英文版）

基　　金：supported by the National Key R&D Programme of China(2022YFA1403000,2022YFA1403800 and 2021YFA0718700);the National Natural Science Foundation of China(12104494,11974409,11974395 and 12188101);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB33000000);the Center for Materials Genome.

摘　　要：Spin texture in k-space is a consequence of spin splitting due to strong spin-orbit coupling and inversion symmetry breaking.It underlies fertile spin transport phenomena and is of crucial importance for spintronics.Here,we observe the spin texture in k-space of nominally centrosymmetric SrIrO_(3)grown on NdGaO_(3)(110)substrates,using non-linear magnetotransport measurements.We demonstrate that the spin texture is not only induced by the interface,which inherently breaks the inversion symmetry in strong spin-orbit coupled SrIrO_(3)films,but also originates from the film bulk.Structural analysis reveals that thicker SrIrO_(3)films exhibit a strain gradient,which could be considered as a continuous change in the lattice constant across different layers and breaks the inversion symmetry throughout the entire SrIrO_(3)films,giving rise to the spin texture in k-space.First-principles calculations reveal that the strain gradient creates large spin-splitting bands,inducing the spin texture with anisotropy,which is consistent with our experimental observations.Our results offer an efficient method for inducing the spin textures in k-space.

关 键 词：spin texture spin-orbit coupling transition metal oxides strain gradient 

分 类 号：TB43[一般工业技术]