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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets II

TT 20.1: Talk

Monday, March 31, 2014, 15:00–15:15, HSZ 304

Magnetic properties of VOMoO₄ and Li₂VOSiO₄: an LDA+DMFT study — •Amin Kiani and Eva Pavarini — Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

By using the local density approximation+dynamical mean field theory and local vertex approximation we calculate the static magnetic response function overall the Brillouin zone for the two highly correlated materials VOMoO₄ and Li₂VOSiO₄. We show that the vertex function is crucial to understand the magnetic properties. From the q−dependent spin susceptibility we identify the magnetic instabilities related to anti-ferromagnetic and collinear order for VOMoO₄ and Li₂VOSiO₄, respectively. Furthermore we determine the local magnetic moment and the Neel temperature from the high temperature uniform magnetic susceptibility. We also investigate the role of the magnetic coupling in the third dimension.