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Low-temperature specific heat of Sr2RuO4

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Langhammer,  C.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Lang,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Langhammer, C., Steglich, F., Lang, M., & Sasaki, T. (2002). Low-temperature specific heat of Sr2RuO4. European Physical Journal B, 26(4), 413-416. doi:10.1140/epjb/e20020108.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3169-B
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.