Orbital Engineering in Nickelate Heterostructures Driven by Anisotropic Oxygen Hybridization rather than Orbital Energy Levels

被引：29

作者：

Fabbris, G. ^{[1
]}

Meyers, D. ^{[1
]}

Okamoto, J. ^{[2
]}

Pelliciari, J. ^{[3
]}

Disa, A. S. ^{[4
]}

Huang, Y. ^{[3
]}

Chen, Z. -Y. ^{[2
]}

Wu, W. B. ^{[2
]}

Chen, C. T. ^{[2
]}

Ismail-Beigi, S. ^{[4
,5
]}

Ahn, C. H. ^{[4
,5
]}

Walker, F. J. ^{[4
]}

Huang, D. J. ^{[2
,6
]}

Schmitt, T. ^{[3
]}

Dean, M. P. M. ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[2] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[3] Paul Scherrer Inst, Res Dept Synchrotron Radiat & Nanotechnol, CH-5232 Villigen, Switzerland

[4] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

[5] Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06520 USA

[6] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 14期

关键词：

X-RAY-SCATTERING; ELECTRONIC-STRUCTURE; OXIDE HETEROSTRUCTURES; HIGH-RESOLUTION; RARE-EARTH; ABSORPTION SPECTROSCOPY; TRANSITION-METAL; CHARGE-TRANSFER; BAND-GAP; EDGE;

D O I：

10.1103/PhysRevLett.117.147401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Resonant inelastic x-ray scattering is used to investigate the electronic origin of orbital polarization in nickelate heterostructures taking LaTiO3 - LaNiO3 - 3 x (LaAlO3), a system with exceptionally large polarization, as a model system. We find that heterostructuring generates only minor changes in the Ni 3d orbital energy levels, contradicting the often-invoked picture in which changes in orbital energy levels generate orbital polarization. Instead, O K-edge x-ray absorption spectroscopy demonstrates that orbital polarization is caused by an anisotropic reconstruction of the oxygen ligand hole states. This provides an explanation for the limited success of theoretical predictions based on tuning orbital energy levels and implies that future theories should focus on anisotropic hybridization as the most effective means to drive large changes in electronic structure and realize novel emergent phenomena.

引用

页数：6

共 76 条

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