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Superconductivity of A15-and σ-phase of Nb-Ir

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Abstract

The superconducting properties of A15-, σ-, and tetragonal phases of the system Nb−Ir were investigated. The alloys were prepared by sintering and arc melting. They were subjected to optical and scanning electron microscopy. The lattice parameters were determined by x-ray diffraction technique. Superconducting transition temperatures,T c , as well as upper critical fields,H c2, were measured inductively and resistively. TheT c -values of the σ-phase vary between 2.15 and 2.40 K whereas for the A15-phase they vary between 1.83 and 2.73 K. TheT c -value of the tetragonal phase is 3.81 K. The upper critical fields of the tetragonal and the A 15-phase are nearly the same (≈13 kG) and lower compared with that of the σ-phase (≈18 kG). Several theoretically predicted values ofH c2(0) are evaluated and compared with the experimental ones.

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Authors and Affiliations

  1. Forschungsinstitut für Edelmetalle und Metallchemie, D-7070, Schwäbisch Gmünd, Germany

    H. R. Khan & Ch. J. Raub

  2. Institut für Atom-und Festkörperphysik, Freie Universität Berlin, D-1000, Berlin 33, Germany

    K. Lüders & Z. Szücs

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  1. H. R. Khan
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  2. Ch. J. Raub
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  3. K. Lüders
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  4. Z. Szücs
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Khan, H.R., Raub, C.J., Lüders, K. et al. Superconductivity of A15-and σ-phase of Nb-Ir. Appl. Phys. 19, 231–235 (1979). https://doi.org/10.1007/BF00932403

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