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ID 19273
file
creator
Haverkort, Maurits W.
Hu, Zhiwei
Cezar, Júlio C.
Burnus, Tobias
Hartmann, Helena
Reuther, Marco
Zobel, C.
Lorenz, Thomas
Brookes, Nicholas B.
Hsieh, Hui-Huang
Lin, Hong-Ji
Chen, Chien-Te
Tjeng, L. Hao
abstract
Using soft x-ray absorption spectroscopy and magnetic circular dichroism at the Co-L2,3 edge, we reveal that the spin state transition in LaCoO3 can be well described by a low-spin ground state and a triply degenerate high-spin first excited state. From the temperature dependence of the spectral line shapes, we find that LaCoO3 at finite temperatures is an inhomogeneous mixed-spin state system. It is crucial that the magnetic circular dichroism signal in the paramagnetic state carries a large orbital momentum. This directly shows that the currently accepted low- or intermediate-spin picture is at variance. Parameters derived from these spectroscopies fully explain existing magnetic susceptibility, electron spin resonance, and inelastic neutron data.
journal title
Physical Review Letters
volume
Volume 97
issue
Issue 17
start page
176405-1
end page
176405-4
date of issued
2006-10-26
publisher
American Physical Society
issn
0031-9007
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006 The American Physical Society.
relation url
department
Graduate School of Advanced Sciences of Matter