Hemberger J, Krug von Nidda H-A, Fritsch V, Deisenhofer J, Lobina S, Rudolf T, Lunkenheimer P, Lichtenberg F, Loidl A, Bruns D, Büchner B
EKM, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
Phys Rev Lett. 2003 Aug 8;91(6):066403. doi: 10.1103/PhysRevLett.91.066403. Epub 2003 Aug 5.
LaTiO3 is known as a Mott insulator which orders antiferromagnetically at T(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(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.
