Anisotropy of Mott-Hubbard gap transitions due to spin and orbital ordering in LaVO3 and YVO3
Shigeki Miyasaka, Yoichi Okimoto, Yoshinori Tokura
TL;DR
This study investigates how spin and orbital orderings influence the anisotropic optical spectra and Mott-Hubbard gap transitions in LaVO3 and YVO3, revealing their correlation and temperature evolution.
Contribution
It provides new insights into the anisotropic optical properties linked to spin and orbital orderings in these vanadate compounds.
Findings
Observation of orbital-dependent Mott-Hubbard gap transitions around 2 eV.
Distinct anisotropy and selection rules in optical transitions.
Temperature dependence reveals spin and orbital ordering correlations.
Abstract
Anisotropic optical spectra coupled with antiferromagnetic spin ordering (SO) and orbital ordering (OO) have been investigated for single crystals of LaVO_{3} and YVO_{3}. The orbital-dependent Mott-Hubbard gap transitions are observed around 2 eV. The transitions composed of the two peaks show distinct anisotropy and selection rules, reflecting the respective SO and OO patterns. The temperature dependence of the anisotropic transitions clearly indicates the SO/OO correlation and the evolution of the order parameters.
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