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Abstract:
We report low-temperature measurements 0.07 K less than or equal to T less than or equal to 2 K of the specific heat, C, of the perovskite superconductor Sr2RuO4. Based on a detailed analysis of our data with respect to both sample quality (as measured by T-c = 0.43 K - 1.17 K) and magnetic-field dependence, it is shown that the electronic contribution to the specific heat, which contains the desired information on the gap structure, is superimposed by at least two additional contributions: a Schottky-type hump at T approximate to 0.1-0.2 K and a low-temperature upturn in C/T at T < 0.1 K. We discuss possible origins of these additional contributions and their implications for the interpretation of low-temperature C(T) data.
