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arXiv · 1406.2433

Latent Instabilities in Metallic LaNiO3 Films by Strain Control of Fermi-Surface Topology

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·Ji Hoon Shim·Tae Won Noh
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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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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, Ji Hoon Shim, Tae Won Noh. 2015-03-04. Latent Instabilities in Metallic LaNiO3 Films by Strain Control of Fermi-Surface Topology. https://doi.org/10.1038/srep08746

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