Latent instabilities in metallic LaNiO 3 films by strain control of Fermi-surface topology

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Title
Latent instabilities in metallic LaNiO 3 films by strain control of Fermi-surface topology
Author(s)
Hyang Keun Yoo; Hyun S.I.; Moreschini L.; Hyeong-Do Kim; Chang Y.J.; Chang Hee Sohn; Da Woon Jeong; Soobin Sinn; Yong Su Kim; Bostwick A.; Rotenberg E.; Shim J.H.; Tae Won Noh
Publication Date
2015-03
Journal
SCIENTIFIC REPORTS, v.5, no., pp.8746 -
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://pr.ibs.re.kr/handle/8788114/2078
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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