Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets III
TT 47.1: Vortrag
Dienstag, 1. April 2014, 14:00–14:15, HSZ 03
Spin Heat-Conductivity of Two-Dimensional Antiferromagnets coupled to Phonons — •Wolfram Brenig1,2 and Alexander L Chernyshev3 — 1Institute for Theoretical Physics, Technical University Braunschweig, Germany — 2Technical University of Lower Saxony, NTH, Germany — 3Department of Physics, University of California, Irvine, USA
We present results of a study of thermal transport due to magnons in two dimensional spin-1/2 Heisenberg antiferromagnets on the square lattice, subject to dissipation by lattice degrees of freedom. The spin phonon scattering is described in terms of magnetoelastic coupling to either acoustic of optical lattice modes. The thermal conductivity and transport relaxation rates will be evaluated using both, a memory function approach and Boltzmann equations. The temperature dependence of the transport will be analyzed in terms of various asymptotic scattering processes. Implications for recent observations of magnetic thermal transport in layered cuprate materials will be discussed.