Evidence for Jahn-Teller distortions at the antiferromagnetic transition in LaTiO${}_3$

Abstract

LaTiO${}_3$ is known as Mott-insulator which orders antiferromagnetically at $T_{\mathrm{N}}=146$ 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 $T_{\mathrm{N}}$ 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.

4 pages, 4 figures; published in Phys. Rev. Lett. 91, 066403 (2003)

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