The impact of nuclear magnetism on superconductivity |
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Authors: | Thomas Herrmannsdrfer |
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Institution: | Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany |
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Abstract: | The influence of nuclear magnetism on the superconducting critical field Bc has been measured in the nuclear magnets Al, AuIn2, and Sn, at ultralow temperatures, 17 μKT1 K. The materials have been chosen in respect to their distinctive Korringa constants κ(Al, AuIn2, Sn)=(1.8, 0.1, 0.05) Ks. Both in the weakly and in the strongly coupled nuclear magnets, Al and Sn, a reduction of Bc is observed being proportional to the nuclear magnetization at T4 mK. However, using the high resolution of the experiment performed on Sn, the decrease of Bc at cooling down to 70 μK is found to be nonmonotonic. The features of the recently measured Bc(T) curve of Sn which are not understood yet as well as the formerly observed results of the interplay of nuclear ferromagnetism and superconductivity in AuIn2 have motivated ongoing experiments which try to clear up the pair breaking contribution of nuclear magnetism. |
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Keywords: | Hyperfine interaction Interplay between nuclear magnetism and superconductivity RKKY exchange |
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