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

Abstract

Measurements of the thermal conductivity as a function of temperature and magnetic field in the 2D dimer spin system SrCu${}_2$(BO${}_3$)${}_2$ are presented. In zero magnetic field the thermal conductivity along and perpendicular to the magnetic planes shows a pronounced double-peak structure as a function of temperature. The low-temperature maximum is drastically suppressed with 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.

a bit more than 4 pages, 2 figures included; minor changes to improve the clarity of the presentation

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