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Updated: Mar 2, 2026

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Published on: July 4, 2016
Optical evidence for the spin-state disorder in LaCo1-xRhxO3
Ichiro Terasaki1, Shinichiro Asai1, Hiroki Taniguchi1
1Department of Physics, Nagoya University, Nagoya 464-8602, Japan.
None:
We have measured the infrared reflectivity of single-crystalline samples of LaCo1-xRhxO3(x = 0, 0.05 and 0.10) from 10 to 300 K from 0.05 to 0.15 eV. We find that the optical phonons of the Co-O stretching mode depend on temperature and the Rh content. Analysis with three Lorentz oscillators reveals that the spin state of Co3+in LaCo1-xRhxO3can be understood in terms of a solid solution of low-spin- and high-spin-state Co3+ions, and the substituted Rh ion retains some fraction of the high-spin Co3+ions down to low temperature.
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