Heat transport in SrCu2(BO3)2 and CuGeO3
M. Hofmann, T. Lorenz, A. Freimuth, G. S. Uhrig, H. Kageyama, Y. Ueda, G. Dhalenne, A. Revcolevschi
Abstract
In the low dimensional spin systems SrCu2(BO3)2 and CuGeO3 the thermal conductivities along different crystal directions show pronounced double-peak structures and strongly depend on magnetic fields. For SrCu2(BO3)2 the experimental data can be described by a purely phononic heat current and resonant scattering of phonons by magnetic excitations. A similar effect seems to be important in CuGeO3, too but, in addition, a magnetic contribution to the heat transport may be present.
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