Spin-state transition in LaCoO 3: direct neutron spectroscopic evidence of excited magnetic states
A gradual spin-state transition occurs in LaCoO3 around T∼80-120 K, whose detailed nature remains controversial. We studied this transition by means of inelastic neutron scattering and found that with increasing temperature an excitation at ∼0.6 meV appears, whose intensity increases with temperatur...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 December 2006
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| In: |
Physical review letters
Year: 2006, Volume: 97, Issue: 24, Pages: 247208 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.97.247208 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevLett.97.247208 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.97.247208 
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| Author Notes: | A. Podlesnyak, S. Streule, J. Mesot, M. Medarde, E. Pomjakushina, K. Conder, A. Tanaka, M.W. Haverkort, and D.I. Khomskii |
| Summary: | A gradual spin-state transition occurs in LaCoO3 around T∼80-120 K, whose detailed nature remains controversial. We studied this transition by means of inelastic neutron scattering and found that with increasing temperature an excitation at ∼0.6 meV 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 120 K above the ground state. We further discuss the nature of the magnetic excited state in terms of intermediate-spin (t52ge1g, S=1) versus high-spin (t42ge2g, 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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| Item Description: | Die Ziffer "3" im Titel ist tiefgestellt Gesehen am 08.11.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.97.247208 |