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通过费米面拓扑结构的应变控制实现金属LaNiO₃薄膜中的潜在不稳定性

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

作者信息

Yoo Hyang Keun, Hyun Seung Ill, Moreschini Luca, Kim Hyeong-Do, Chang Young Jun, Sohn Chang Hee, Jeong Da Woon, Sinn Soobin, Kim Yong Su, Bostwick Aaron, Rotenberg Eli, Shim Ji Hoon, Noh Tae Won

机构信息

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.

Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.

出版信息

Sci Rep. 2015 Mar 4;5:8746. doi: 10.1038/srep08746.

DOI:10.1038/srep08746
PMID:25735658
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4348653/
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.

摘要

应变控制是在过渡金属氧化物薄膜中寻找新的涌现现象最有前景的途径之一。在此，我们使用角分辨光电子能谱和动态平均场理论，研究了强关联的LaNiO3（LNO）薄膜中应变诱导的电子结构变化。失配应变会系统地重新排列强重整化的eg轨道能带，从而改变其费米面学。随着拉伸应变增加，位于A点的空穴口袋沿kz轴伸长，似乎变得开放，从而将费米面（FS）拓扑结构从三维变为准二维。同时，FS形状变得扁平以增强FS嵌套。所有LNO薄膜中都出现了Q1 = (1/2,1/2,1/2)的FS超结构，而拉伸应变的LNO薄膜还有额外的Q2 = (1/4,1/4,1/4)调制，这表明金属LNO薄膜中存在一些不稳定性。在其他镍酸盐中观察到的电荷歧化和自旋密度波涨落可能是其最可能的起源。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/02faf1b499c2/srep08746-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/dc4213a2e5a5/srep08746-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/52863cff5eff/srep08746-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/0bec5bb51f9b/srep08746-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/02faf1b499c2/srep08746-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/dc4213a2e5a5/srep08746-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/52863cff5eff/srep08746-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/0bec5bb51f9b/srep08746-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0743/4348653/02faf1b499c2/srep08746-f4.jpg

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