Wednesday, May 25, 2005, 3:30 pm — Small Seminar Room, Bldg. 510
Recent experiments in the low-dimensional quantum magnets have revealed very large, anisotropic thermal conductivity, comparable to that of metallic systems.
We develop a microscopic approach to the problem of 1D spin-boson excitations in spin-chain systems coupled to the 3D phonon environment and impurities and consider the problem of the heat transport in spin-chains within the Boltzmann equation framework. We show that the low-temperature transport is dominated by impurity scattering while the high temperature transport is determined by both the impurity and spin-phonon scatterings. Our results are in a very good quantitative agreement with the experimental data. We obtained an insight into various microscopic
details of the problem which allowed us to formulate several unusual predictions and suggest future experiments.
Hosted by: Cedomir Petrovic
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