The T c behavior of vapor-deposited Nb3Ge and Nb3Sn is examined as a function of low-fluence alpha-particle irradiation. It is found that for Nb3Sn with ϱ ∼ 15 ΜΩ-cm the T c is insensitive to low doses of radiation, whereas Nb3Ge with ϱ0 ∼ 50 ΜΩ-cm has its T c depressed immediately with irradiation. It is suggested that the T c behavior of A-15 superconductors in the regime of small dose is strongly influenced by the initial state of the sample. Furthermore, it is argued that the behavior of the T c with dose can be qualitatively explained by considering a sharp structure in the density of states N(E), the smearing of which by defects leads to a depression in T c .
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Work performed under the auspices of the U.S. Energy Research and Development Administration.
Also at Materials Science Department, SUNY at Stony Brook.
Also at Physics Department, SUNY at Stony Brook.
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Wiesmann, H., Gurvitch, M., Ghosh, A.K. et al. Superconductivity in irradiated A-15 compounds at low fluences II. Alpha-particle-irradiated Nb3Sn and Nb3Ge. J Low Temp Phys 30, 513–519 (1978). https://doi.org/10.1007/BF00114965
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DOI: https://doi.org/10.1007/BF00114965