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27 April 2024

» arxiv » cond-mat/0303070

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Evidence for Jahn-Teller distortions at the antiferromagnetic transition in LaTiO$_3$
J. Hemberger ; H.-A. Krug von Nidda ; V. Fritsch ; J. Deisenhofer ; S. Lobina ; T. Rudolf ; P. Lunkenheimer ; F. Lichtenberg ; A. Loidl ; D. Bruns ; B. Büchner ;
Date:	4 Mar 2003
Subject:	Strongly Correlated Electrons DOI: 10.1103/PhysRevLett.91.066403 \| cond-mat.str-el
Abstract:	LaTiO$_3$ is known as Mott-insulator which orders antiferromagnetically at $T_{ m N}=146$ K. We report on results of thermal expansion and temperature dependent x-ray diffraction together with measurements of the heat capacity, electrical transport measurements, and optical spectroscopy in untwinned single crystals. At $T_{ m N}$ significant structural changes appear, which are volume conserving. Concomitant anomalies are also observed in the dc-resistivity, in bulk modulus, and optical reflectivity spectra. We interpret these experimental observations as evidence of orbital order.
Source:	arXiv, cond-mat/0303070
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