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TT: Fachverband Tiefe Temperaturen

TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets III

TT 47.1: Talk

Tuesday, April 1, 2014, 14:00–14:15, HSZ 03

Spin Heat-Conductivity of Two-Dimensional Antiferromagnets coupled to Phonons — •Wolfram Brenig^1,2 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.