Journal Article Optical evidence for the spin-state disorder in LaCo1−x RhxO3

Terasaki, Ichiro  ,  Asai, Shinichiro  ,  Taniguchi, Hiroki  ,  Okazaki, Ryuji  ,  Yasui, Yukio  ,  Ikemoto, Yuka  ,  Moriwaki, Taro

29 ( 23 )  , pp.235802 - 235802 , 2017-06 , IOP publishing
ISSN:0953-8984
Description
We have measured the infrared reflectivity of single-crystalline samples of LaCo1−x RhxO3 (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 Co^3+ in LaCo1−x RhxO3 can be understood in terms of a solid solution of low-spin- and high-spin-state Co^3+ ions, and the substituted Rh ion retains some fraction of the high-spin Co^3+ ions down to low temperature.
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