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APS » Journals » Phys. Rev. B » Volume 53 » Issue 6
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Phys. Rev. B 53, R2926–R2929 (1996)

Spin-state transition and high-spin polarons in LaCoO3

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S. Yamaguchi, Y. Okimoto, H. Taniguchi, and Y. Tokura
Department of Applied Physics, University of Tokyo, Tokyo 113, Japan

Received 10 August 1995; published in the issue dated 1 February 1996

The spin gap energy (≈ 30 meV) associated with the low-spin (S=0) to high-spin (S=2) transition in LaCoO3 was proved to be considerably smaller than the charge gap energy (≈ 0.1 eV) which was estimated by optical spectroscopy. Hole doping in the low-spin ground state of LaCoO3 leads to formation of localized magnetic polarons with unusually high spin number (S=10-16), which can be viewed as a precursor of the doping-induced ferromagnetic metallic state.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.53.R2926
DOI:
10.1103/PhysRevB.53.R2926
PACS:
 
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