Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Correlated Electrons - Poster Session

TT 79.11: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Theory of Magnetic Excitations in Van Vleck-type Mott insulator on Square Lattice — •Alireza Akbari and Giniyat Khaliullin — Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

We study magnetism in Van Vleck-type d⁴ Mott insulators with square lattice symmetry. A theory includes the exchange interactions, tetragonal crystal field splitting, and spin orbit coupling. We found two different magnetic phases, with in-plane and out-of-plane magnetization for the higher and lower values of the crystal field splitting, respectively. We calculated the excitation spectra for paramagnetic and two magnetically ordered phases. The results are discussed in the context of d⁴ Mott insulator Ca₂RuO₄.