Heat pulse formation of superconducting phases

Current pulses of several amperes applied for ∼1 sec at T≲20 K to quasiamorphous nonsuperconducting (at 4.2 K) films of V3Si, V3Al, Nb3Sn, Nb3Ga, Nb3Al, and Nb3Si cause structural transformations to superconducting phases. The method attempts to utilize kinetics as a new variable in producing metast...

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Bibliographic Details
Published in:Journal of applied physics 1977-05, Vol.48 (5), p.2055-2061
Main Authors: Testardi, L. R., Wakiyama, T., Royer, W. A.
Format: Article
Language:English
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Summary:Current pulses of several amperes applied for ∼1 sec at T≲20 K to quasiamorphous nonsuperconducting (at 4.2 K) films of V3Si, V3Al, Nb3Sn, Nb3Ga, Nb3Al, and Nb3Si cause structural transformations to superconducting phases. The method attempts to utilize kinetics as a new variable in producing metastable superconducting phases. The suggestion is supported by the results for V3Al where Tc onsets ∼12 K or higher are achieved more readily than by other ’’equilibrium’’ growth methods. For Nb3Si several films with Tc onsets ∼12 K show the method can produce Tc’s which are higher than those obtained by hot-substrate deposition. Though much less tested, films irradiated by laser pulses at 300 K showed qualitatively similar behavior.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.323917