Thermal Transport in CuSb$_2$O$_6$ single crystals

CuSb$_2$O$_6$ behaves as a uniform, one-dimensional (1D) $S=1/2$ Heisenberg spin chain with long-range, antiferromagnetic ordering below $T_N\simeq 8.5$~K.\footnote{A. Nakua {\it et al.}, J. Solid State Chem. {\bf 91}, 105 (1991); B. J. Gibson {\it et al.}, J. Magn. Magn. Mater. {\bf 272-276}, 927 (2004).} Unusual for cuprates, the Cu$^{2+}$ ions lie within quite regular CuO$_6$ octahedra and 1D magnetism appears to arise from orbital ordering driven by correlation effects.\footnote{Deepa Kasinathan, Klaus Koepernik, and Helge Rosner, Phys. Rev. Lett. {\bf 100}, 237202 (2008).} We will report the results of thermal conductivity measurements on single crystals over the temperature range $5{\rm K}\leq {\rm T}\leq 330 {\rm K}$.