Latent instabilities in metallic LaNiO3 films by strain control of Fermi-surface topology.
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.
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.
Hyang Keun
HK
Yoo
Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
Seung Ill
SI
Hyun
Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Luca
L
Moreschini
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.
Hyeong-Do
HD
Kim
1] Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA [2] Department of Physics, University of Seoul, Seoul 130-743, Republic of Korea.
Young Jun
YJ
Chang
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.
Chang Hee
CH
Sohn
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.
Da Woon
DW
Jeong
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.
Soobin
S
Sinn
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.
Yong Su
YS
Kim
Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Aaron
A
Bostwick
Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Eli
E
Rotenberg
1] Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea [2] Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
Ji Hoon
JH
Shim
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.
Tae Won
TW
Noh