Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology.

Sci Rep

1] Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 151-747, Republic of Korea [2] Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Republic of Korea.

Published: March 2015

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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4348653PMC
http://dx.doi.org/10.1038/srep08746DOI Listing

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