Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.50: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
The S=1/2 Heisenberg model on the 2D orthorhombic lattice: A numerical study — •Mohammad Siahatgar, Burkhard Schmidt, and Peter Thalmeier — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
The ground state properties and finite temperature behavior of the S=1/2 frustrated Heisenberg model on the 2D orthorhombic lattice are studied using exact diagonalization. This model, named as the J1a,b−J2 model, can be used to describe the low energy spin excitation of the parent compounds of newly discovered iron based superconductors, as well as two classes of layered vanadium phosphate, based on the data obtained from inelastic neutron scattering. Using the finite temperature Lanczos method, the ground state energy and the temperature dependence of the specific heat, magnetic susceptibility and staggered magnetization are calculated. For the latter different lattice sizes and geometries are used to investigate the finite size effect.