Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 3 (jointly with MA)
TT 30.13: Talk
Tuesday, March 17, 2015, 12:45–13:00, H 0110
Local and non-local correlation effects on the frustration degree in VOMoO4 and Li2VOSiO4 — •Amin Kiani and Eva Pavarini — Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich, Germany
VOMoO4 and Li2VOSiO4 are considered a realization of the two-dimensional J1-J2 quantum antiferromagnetic Heisenberg model. In order to study their magnetic properties we calculate the static lattice spin susceptibility χ(q,T) by using the local density approximation+dynamical mean field theory (LDA+DMFT) and its cluster extension; we adopt the local vertex approximation. We show that both systems undergo a phase transition to a three-dimensional ordered state with in-plane antiferromagnetic Neel order for VOMoO4 and in-plane antiferromagnetic collinear order for Li2VOSiO4. We extract the effective magnetic couplings from the high temperature magnetic susceptibility. For both materials we discuss the frustration degree and local and non-local correlations effects.