Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: CE: Low-dimensional Systems - Models 1
TT 30.8: Vortrag
Donnerstag, 25. März 2010, 11:30–11:45, H20
Spin Phonon Interactions in triangular Antiferromagnets — Andreas Kreisel and •Peter Kopietz — Institut für Theoretische Physik, Goethe Universität Frankfurt, Max-von-Laue Strasse 1, D-60438 Frankfurt (M), Germany
The triangular lattice antiferromagnet has been recognized a long time ago to be an ideal system to study the effect of quantum fluctuations and frustration in reduced dimensions. If the exchange couplings are spatially anisotropic as in the compound Cs2CuCl4, one can observe an ordered phase at very low temperatures. A standard experimental technique to explore the phase boundary is the measurement of the ultrasound attenuation. In order to describe this process theoretically, we consider the exchange striction coupling between magnons and phonons in the ordered phase of the triangular lattice antiferromagnet and calculate the renormalization of the phonon excitations due to the coupling to the magnons.