中国物理B ›› 2023, Vol. 32 ›› Issue (8): 87105-087105.doi: 10.1088/1674-1056/acd368
Dachuan Chen(陈大川)1,2, Paul Worm3, Liang Si(司良)4,3, Chunxiao Zhang(张春小)5, Fenglin Deng(邓凤麟)1, Peiheng Jiang(蒋沛恒)1,†, and Zhicheng Zhong(钟志诚)1,‡
Dachuan Chen(陈大川)1,2, Paul Worm3, Liang Si(司良)4,3, Chunxiao Zhang(张春小)5, Fenglin Deng(邓凤麟)1, Peiheng Jiang(蒋沛恒)1,†, and Zhicheng Zhong(钟志诚)1,‡
摘要: The discovery of superconductivity in Sr/Ca-doped infinite-layer nickelates Nd(La)NiO2 thin films inspired extensive experimental and theoretical research. However, research on the possibilities of enhanced critical temperature by interface heterostructure is still lacking. Due to the similarities of the crystal structure and band structure of infinite-layer nickelate LaNiO2 and cuprate CaCuO2, we investigate the crystal, electronic and magnetic properties of LaNiO2:CaCuO2 heterostructure using density functional theory and dynamical mean-field theory. Our theoretical results demonstrate that, even a very weak inter-layer z-direction bond is formed, an intrinsic charge transfer between Cu-3dx2-y2 and Ni-3dx2-y2 orbitals is obtained. The weak interlayer hopping between Cu and Ni leaves a parallel band contributed by Ni/Cu-3dx2-y2 orbitals near the Fermi energy. Such an infinite-layer heterostructure with negligible interlayer interaction and robust charge transfer opens a new way for interface engineering and nickelate superconductors.
中图分类号: (Electron density of states and band structure of crystalline solids)