Anomalous Properties of Single Crystal Niobium

ORAL

Abstract

A number of anomalous properties have been observed in niobium over the years. The most striking, perhaps, is the anisotropic upper critical field, H$_{c2}$, in the superconducting state. Nb has also been observed to exhibit a ``peak effect,'' a peak in the critical current near T$_{c}$. Experimental evidence will be presented that identifies the source of some of these anomalies as due to interstitial hydrogen at concentrations of a few percent. Thermal expansion, specific heat, resistivity versus temperature, and other data will be presented.

*This material is based upon work supported by the US DOE (DE-FG-06ER46269) and NSF (DMR-0504769).

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Authors

  • Richard K. Bollinger

    • Montana State University

  • Ben D. White

    • Montana State University

  • John J. Neumeier

    • Physics, Montana State U.
    • Montana State University

  • Yoko Suzuki

    • Los Alamos National Laboratory
    • National High Magnetic Field Laboratory - Los Alamos National Laboratory

  • Jon Betts

    • Los Alamos National Laboratory
    • LANL
    • National High Magnetic Field Laboratory - Los Alamos National Laboratory

  • Albert Migliori

    • National High Magnetic Field Laboratory - Los Alamos National Laboratory

  • Hugo R. Z. Sandim

    • Escola de Engenharia de Lorena - USP

  • Carlos dos Santos

    • Escola de Engenharia de Lorena - USP