Abstract
We have studied the thermal conductivity of Tl 2Ba 2CuO 6 (Tl-2201) crystals as functions of temperature and magnetic field. A thermal conductivity peak is observed near 0.6 T c which is greatly reduced on application of a magnetic field along the c axis. We argue that the suppression of the peak at relatively low fields (≤ 8 T ⪡ H c2) permits us to separate electronic and phononic contributions. Fields applied in plane are less effective, but give the same reduction when applied either parallel or perpendicular to the temperature gradient. A model based on Andreev reflection by vortex screening currents is shown to be consistent with these results.
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