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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.8: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Scattering of heavy fermions and slow spin waves off fast phonons — •David Rasch and Achim Rosch — Institute for Theoretical Physics, University of Cologne, 50937 Köln, Germany

While in ordinary metals and antiferromagnets the velocity of sound is much smaller than the velocity of the electrons or spin waves, this is not the case in heavy fermion compounds or magnetic systems with small exchange couplings. The latter systems have recently been studied extensively in the context of field tuned quantum phase transitions and the Bose Einstein condensation of magnons. We investigate the scattering of fast phonons from slow electronic and spin excitations and study its influence on heat transport. Here we focus on the transport properties of spin chains and spin ladders coupled to three dimensional phonons.