Low temperature Schottky anomalies in the specific heat of LaCoO 3: Defect-stabilized finite spin states

C. He, H. Zheng, J. F. Mitchell, M. L. Foo, R. J. Cava, C. Leighton

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Abstract

Measurement of the low temperature specific heat of LaCoO3 single crystals reveals a previously unobserved Schottky anomaly with an energy level splitting, 0.5 meV, that is associated with the first excited spin state of the Co3+ ion. These states persist well below 2 K and have a g -factor around 3.5, consistent with the high-spin spin-orbit triplet, implying the existence of a low density (approximately 0.1% of the sites) of finite-spin Co ions even in the T=0 limit. We propose that these states are trapped at defects and are consistent with the magnetic excitons observed in earlier work.

Original languageEnglish (US)
Article number102514
JournalApplied Physics Letters
Volume94
Issue number10
DOIs
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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