Universität zu Köln

Reul, J., Nugroho, A. A., Palstra, T. T. M. and Grueninger, M. (2012). Probing orbital fluctuations in RVO3 (R = Y, Gd, or Ce) by ellipsometry. Phys. Rev. B, 86 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

We study optical excitations across the Mott gap in the multiorbital Mott-Hubbard insulators RVO3. The multipeak structure observed in the optical conductivity can be described consistently in terms of the different 3d(3) multiplets or upper Hubbard bands. The spectral weight is very sensitive to nearest-neighbor spin-spin and orbital-orbital correlations and thus shows a pronounced dependence on both temperature and polarization. Comparison with theoretical predictions based on either rigid orbital order or strong orbital fluctuations clearly rules out that orbital fluctuations are strong in RVO3. Both the line shape and the temperature dependence give clear evidence for the importance of excitonic effects.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Reul, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nugroho, A. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palstra, T. T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-482882
DOI:	10.1103/PhysRevB.86.125128
Journal or Publication Title:	Phys. Rev. B
Volume:	86
Number:	12
Date:	2012
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1098-0121
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRANSITION-METAL OXIDES; ELECTRONIC-STRUCTURE; YVO3; SPIN; EXCITATIONS; INSULATORS; LAVO3; ORDER Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48288