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  • Title: Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology.
    Author: Yoo HK, Hyun SI, Moreschini L, Kim HD, Chang YJ, Sohn CH, Jeong DW, Sinn S, Kim YS, Bostwick A, Rotenberg E, Shim JH, Noh TW.
    Journal: Sci Rep; 2015 Mar 04; 5():8746. PubMed ID: 25735658.
    Abstract:
    Strain control is one of the most promising avenues to search for new emergent phenomena in transition-metal-oxide films. Here, we investigate the strain-induced changes of electronic structures in strongly correlated LaNiO3 (LNO) films, using angle-resolved photoemission spectroscopy and the dynamical mean-field theory. The strongly renormalized eg-orbital bands are systematically rearranged by misfit strain to change its fermiology. As tensile strain increases, the hole pocket centered at the A point elongates along the kz-axis and seems to become open, thus changing Fermi-surface (FS) topology from three- to quasi-two-dimensional. Concomitantly, the FS shape becomes flattened to enhance FS nesting. A FS superstructure with Q1 = (1/2,1/2,1/2) appears in all LNO films, while a tensile-strained LNO film has an additional Q2 = (1/4,1/4,1/4) modulation, indicating that some instabilities are present in metallic LNO films. Charge disproportionation and spin-density-wave fluctuations observed in other nickelates might be their most probable origins.
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