Spin-State Transition in LaCoO3 : Direct Neutron Spectroscopic Evidence of Excited Magnetic States

Physical Review Letters Volume 97 Issue 24 Page 247208-1-247208-4 published_at 2006-12-15
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Title ( eng )
Spin-State Transition in LaCoO3 : Direct Neutron Spectroscopic Evidence of Excited Magnetic States
Creator
Podlesnyak A.
Streule S.
Mesot J.
Medarde M.
Pomjakushina E.
Conder K.
Haverkort Maurits W.
Khomskii D.I.
Source Title
Physical Review Letters
Volume 97
Issue 24
Start Page 247208-1
End Page 247208-4
Abstract
A gradual spin-state transition occurs in LaCoO3 around T∼80-120K, whose detailed nature remains controversial. We studied this transition by means of inelastic neutron scattering and found that with increasing temperature an excitation at ∼0.6meV appears, whose intensity increases with temperature, following the bulk magnetization. Within a model including crystal-field interaction and spin-orbit coupling, we interpret this excitation as originating from a transition between thermally excited states located about 120K above the ground state. We further discuss the nature of the magnetic excited state in terms of intermediate-spin (t2g5eg1, S=1) versus high-spin (t2g4eg2, S=2) states. Since the g factor obtained from the field dependence of the inelastic neutron scattering is g∼3, the second interpretation is definitely favored.
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2006-12-15
Rights
Copyright (c) 2006 The American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.97.247208
[NCID] AA00773679
[DOI] http://dx.doi.org/10.1103/PhysRevLett.97.247208