Orbital fluctuations in the different phases of LaVO3 and YVO3

Details Orbital fluctuations in the different phases of LaVO3 and YVO3 Orbital fluctuations in the different phases of LaVO3 and YVO3

2007-02-13

arxiv.org/abs/cond-mat/0702316v2

Phys. Rev. Lett. 99, 126402 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, final version. To appear in PRL

Scientific paper

10.1103/PhysRevLett.99.126402

We investigate 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.

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