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We have measured the thermal conductivity parallel to the a-axis of theZn-free and 1% Zn-substituted SrCu$_{2-x}$Zn$_x$(BO$_3$)$_2$ in magnetic fieldsup to 14 T, in order to examine the thermal conductivity due to themulti-triplet magnons. It has been found that the thermal conductivity peakobserved in the spin gap state is suppressed by the substitution of Zn for Cuin high magnetic fields above 6 T, while it is not changed in low magneticfields below 6 T. The results suggest that the thermal conductivity peak in thespin-gap state of SrCu$_2$(BO$_3$)$_2$ is composed of not only thermalconductivity due to phonons but also that due to the multi-triplet magnons inhigh fields above 6 T.Comment: 7 pages, 2 figure

Multi-Triplet Magnons in SrCu2(BO3)2Studied by Thermal Conductivity Measurements in Magnetic Fields

Multi-Triplet Magnons in SrCu₂(BO₃)₂Studied by Thermal Conductivity Measurements in Magnetic Fields