Orbital Fluctuations in the Different Phases of LaVO3 and YVO3

De Raychaudhury, M.; Pavarini, E.; Andersen, O. K.

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Orbital Fluctuations in the Different Phases of LaVO₃ and YVO₃

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Pavarini, E.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Andersen, O. K.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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De Raychaudhury, M., Pavarini, E., & Andersen, O. K. (2007). Orbital Fluctuations in the Different Phases of LaVO₃ and YVO₃. Physical Review Letters, 99(12): 126402.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B7FF-5

Abstract

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 t(2g) 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.