Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets II
TT 20.1: Vortrag
Montag, 31. März 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.