Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology
SCIE
SCOPUS
- Title
- Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology
- Authors
- Hyang Keun Yoo; Seung Ill Hyun; Luca Moreschini; Hyeong-Do Kim; Young Jun Chang; Chang Hee Sohn; Da Woon Jeong; Soobin Sinn; Yong Su Kim; Aaron Bostwick; Eli Rotenberg; Shim, JH; Tae Won Noh
- Date Issued
- 2015-03-04
- Publisher
- NATURE PUBLISHING GROUP
- 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 LaNiO 3 (LNO) films, using angle-resolved photoemission spectroscopy and the dynamical mean-field theory. The strongly renormalized e g -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 k z -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 Q 1 = (1/2,1/2,1/2) appears in all LNO films, while a tensile-strained LNO film has an additional Q 2 = (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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13176
- DOI
- 10.1038/SREP08746
- ISSN
- 2045-2322
- Article Type
- Article
- Citation
- SCIENTIFIC REPORTS, vol. 5, 2015-03-04
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