Abstract
The low-temperature c-axis thermal expansion of a thin-film sample of the superconducting material Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub x/ was measured to 10 K. Based on standard ac resistance measurements, the material exhibits a detectable drop at 110 K and zero resistance at 78 K. Careful x-ray measurements between 10 and 300 K reveal a uniform, monotonic c-axis expansion of about 0.4%, similar to what has been previously found for La/sub 1.9/Ba/sub 0.1/CuO/sub 4/ and YBa/sub 2/Cu/sub 3/O/sub 7/. Although anomalous c-axis thermal expansion has been recently reported in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ a careful search in the vicinity of T/sub c/ failed to reveal anything unusual in this material.
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