Abstract:
We report low-temperature measurements 0.07 K ? T ? 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 ≈ 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.
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Received 23 August 2001
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Langhammer, C., Steglich, F., Lang, M. et al. Low-temperature specific heat of Sr2RuO4 . Eur. Phys. J. B 26, 413–416 (2002). https://doi.org/10.1140/epjb/e20020108
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DOI: https://doi.org/10.1140/epjb/e20020108