Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Correlated Electrons: Metal-Insulator Transition 2
TT 34.1: Vortrag
Donnerstag, 28. Februar 2008, 14:00–14:15, H 2053
Phase transitions and orbital fluctuations in 3d2 vanadates — •Eva Pavarini1, Molly De Raychaudhury2, and Ole K. Andersen3 — 1Institut für Festkörperforschung, Forschungzentrum Jülich, Jülich, Germany — 2S.N. Bose National Centre for Basic Sciences, Kolkata, India — 3Max-Planck Institut für Festkörperforschung, Stuttgart, Germany
We investigate [1] the importance of quantum orbital fluctuations in the orthorhombic and monoclinic phases of the Mott insulators LaVO3 and YVO3. First, we construct ab-initio material-specific t2g Hubbard models. Then, by using dynamical mean-field theory, we calculate the spectral matrix as a function of temperature. Our Hubbard bands and Mott gaps are in very good agreement with spectroscopy. We show that in orthorhombic LaVO3, quantum orbital fluctuations are strong and that they are suppressed only in the monoclinic 140 K phase. In YVO3 the suppression happens already at 300 K. We show that Jahn-Teller and GdFeO3-type distortions are both crucial in determining the type of orbital and magnetic order in the low temperature phases.
[1] M. De Raychahudhury, E. Pavarini, O.K. Andersen, Phys. Rev. Lett. 99, 126402 (2007).