Nonresonant inelastic x-ray scattering and energy-resolved Wannier function investigation of d-d excitations in NiO and CoO

被引：81

作者：

Larson, B. C. ^{[1
]}

Ku, Wei

Tischler, J. Z.

Lee, Chi-Cheng

Restrepo, O. D.

Eguiluz, A. G.

Zschack, P.

Finkelstein, K. D.

机构：

[1] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[3] Tamkang Univ, Dept Phys, Tamsui 25137, Taiwan

[4] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[5] Argonne Natl Lab, Adv Photon Source, XOR UNI, Argonne, IL 60439 USA

[6] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.99.026401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Nonresonant inelastic x-ray scattering measurements on NiO and CoO show that strong dipole-forbidden d-d excitations appear within the Mott gap at large wave vectors. These dominant excitations are highly anisotropic, and have [001] nodal directions for NiO. Theoretical analyses based on a novel, energy-resolved Wannier function (within the local density approximation + Hubbard U) show that the anisotropy reflects the local exciton wave functions and local point-group symmetry. The sensitivity to weak symmetry breaking in particle-hole wave functions suggests a wide application to strongly correlated systems.

引用

页数：4

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