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Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 3: Spin-Systeme und itinerante Magnete

TT 3.12: Talk

Monday, March 8, 2004, 12:15–12:30, H18

Heat Transport in Low Dimensional Spin Systems — •C. Hess1, H. ElHaes2, P. Ribeiro3, B. Büchner3, F. Heidrich-Meisner4, W. Brenig4, M. Hücker5, U. Ammerahl5, and A. Revcolevschi51Department of Condensed Matter Physics, University of Geneva, Switzerland — 2II. Physikalisches Institut, RWTH Aachen, Germany — 3IFW Dresden, Germany — 4Institut für Theoretische Physik, TU-Braunschweig, Germany — 5Laboratoire de Physico-Chimie des Solides, Université Paris-Sud, France

We present experimental results for the magnon thermal conductivity κmag of several low dimensional spin systems, like antiferromagnetic planes, ladders and chains. We focus on the quasi two dimensional antiferromagnet La2CuO4 and the spin ladder system (Sr,Ca,La)14Cu24O41, where scattering of the magnetic excitations on static defects, phonons, magnons and holes is analyzed on basis of a kinetic model. The analysis yields for example an intimate relation of magnetic and electronic transport channels in the spin ladders and in both systems a strict limitation of the magnon mean free path lmag by artificially induced non magnetic defects, i.e., lmagdZnZn at low temperatures, where dZnZn is the mean distance of doped Zn-ions in the low dimensional structures. The latter result is in stark contrast to recent model calculations for the heat transport in the spin ladders.

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