Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.76: Poster
Thursday, March 29, 2012, 15:00–19:00, Poster B
Magnetic Impurity with Generalized Couplings to Antiferromagnetic Heisenberg Chains — •Björn Willenberg1,3, Jan Grelik2,3, Wolfram Brenig1,3, and Holger Frahm2,3 — 1Institute for Theoretical Physics, Technische Universität Braunschweig — 2Institute for Theoretical Physics, Leibniz Universität Hannover — 3Niedersächsische Technische Hochschule, NTH
We investigate magnetic spin-S impurities in contact to S=1/2 Heisenberg chains with open boundary conditions and an impurity coupling beyond simple superexchange. We employ finite temperature Quantum Monte-Carlo based on Stochastic Series Expansion. Results will be presented for thermodynamic properties as a function of temperature, exchange-coupling constants, anisotropy, magnetic fields, and system size. These include the energy, susceptibilities, magnetization and static correlation functions. For particular settings the models we investigate are integrable by Bethe Ansatz and we will compare findings from both methods in the limit of zero temperature.