Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2

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  • 1 March 2001
Abstract
Measurements of the thermal conductivity as function of temperature and magnetic field in the 2D dimer spin system SrCu_2(BO_3)_2 are presented. In the heat transport along and perpendicular to the magnetic planes we observe a pronounced double-peak structure in zero field and a drastic suppression of the low-temperature maximum on increasing magnetic field. Our quantitative analysis reveals that the heat current is due to phonons and that the double-peak structure arises from pronounced resonant scattering of phonons by magnetic excitations.

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