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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.78: Poster

Saturday, March 5, 2005, 11:00–16:30, Poster TU C

Finite Temperature Properties of the 2D Kondo-Necklace — •Wolfram Brenig — Institute for Theoretical Physics, Technical University of Braunschweig, Germany

We analyze several thermodynamic properties of the two-dimensional SU(2) Kondo-necklace. Using a quantum Monte-Carlo approach based on the stochastic series expansion method we provide results for the staggered structure factor as well as the uniform and staggered susceptibilities as a function of the temperature and ’Kondo’-exchange in the vicinity of the quantum critical point, which separates long-range antiferromagnetic order from dimerization in this system. We study the local susceptibility at criticality and find evidence for a power-law temperature dependence. Finally we investigate the crossover from classical to renormalized classical behavior via the quantum critical regime. Work supported in part by the DFG through SPP 1073.