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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| File | |
| Title ( eng ) |
Spin-State Transition in LaCoO3 : Direct Neutron Spectroscopic Evidence of Excited Magnetic States
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| Creator |
Podlesnyak A.
Streule S.
Mesot J.
Medarde M.
Pomjakushina E.
Conder K.
Haverkort Maurits W.
Khomskii D.I.
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| Source Title |
Physical Review Letters
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| 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.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 2006-12-15 |
| Rights |
Copyright (c) 2006 The American Physical Society.
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| 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
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