Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons - Poster Session
TT 20.74: Poster
Mittwoch, 28. März 2007, 14:00–17:45, Poster A
On Heat Conduction in Spin Chain Compounds — •Peter Jung1, Rolf Helmes1, Efrat Shimshoni2, and Achim Rosch1 — 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Deptartment of Mathematics and Physics, University of Haifa at Oranim, Qiryat-Tivon 36006, Israel
In recent measurements on spin chain compounds an unexpectedly high contribution to the heat conductivity at intermediate temperatures has been observed. Starting point of the presented analysis is the observation that the Spin-1/2 XXZ-model is integrable, resulting in an infinite heat conductivity. Additional couplings destroy the integrability and relax the heat current. We analyze the effect of various couplings on the heat conductivity, with special emphasis on the breakdown of integrability. We aim towards a complete understanding of the mechanisms of relaxation leading to the experimental results, including disorder effects and the coupling to phonons.