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Static Nuclear Magnetisation of Aluminium Measured by Its Influence on the Superconducting Critical Field

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Abstract

We have measured the temperature dependence of the superconducting critical field of Al in the temperature range 17μK ≤ T ≤ 600mK. The external magnetic field necessary to suppress superconductivity in Al decreases significantly with decreasing T below about 1 mK. This effect is due to the paramagnetic contribution of the nuclear magnetic moments of Al to the total magnetic flux. Our method enables us to determine the static nuclear magnetisation of the Al nuclei. The results are in agreement with the theory for a Langevin nuclear paramagnet. In addition, we have measured the spin lattice relaxation time τ 1 . For the Korringa constant we get τ 1 ·T = (2.0±0.2)K sec in good agreement with previous NMR results.

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Author notes

  1. F. Pobell

    Present address: , Forschungszentrum Rossendorf, D-01314, Dresden, Germany

Authors and Affiliations

  1. Physikalisches Institut, Universität Bayreuth, D-95440, Bayreuth, Germany

    M. Seibold, T. Herrmannsdörfer & F. Pobell

  2. Hahn-Meitner-Institut, Glienicker Str. 100, D-14109, Berlin, Germany

    T. Herrmannsdörfer

Authors
  1. M. Seibold
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  2. T. Herrmannsdörfer
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  3. F. Pobell
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Seibold, M., Herrmannsdörfer, T. & Pobell, F. Static Nuclear Magnetisation of Aluminium Measured by Its Influence on the Superconducting Critical Field. Journal of Low Temperature Physics 110, 363–368 (1998). https://doi.org/10.1023/A:1022501220362

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  • DOI: https://doi.org/10.1023/A:1022501220362

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