Heat transport in SrCu_2(BO_3)_2 and CuGeO_3

M. Hofmann; T. Lorenz; A. Freimuth; G. S. Uhrig; H. Kageyama; Y. Ueda; G. Dhalenne; A. Revcolevschi

doi:10.1016/S0921-4526(01)01185-1

paper

Heat transport in SrCu_2(BO_3)_2 and CuGeO_3

arXiv:cond-mat/0108488 · doi:10.1016/S0921-4526(01)01185-1

Abstract

In the low dimensional spin systems $S r C u_{2} (B O_{3})_{2}$ and $C u G e O_{3}$ the thermal conductivities along different crystal directions show pronounced double-peak structures and strongly depend on magnetic fields. For $S r C u_{2} (B O_{3})_{2}$ 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 $C u G e O_{3}$ , too but, in addition, a magnetic contribution to the heat transport may be present.

4 pages, 2 figures; appears in the proceedings of the SCES2001 (Physica B)