Beams Document 3381-v1

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Radiation effects on MgB2: a review and a comparison with A15 superconductors

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Camille M. Ginsburg
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Camille M. Ginsburg
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04 May 2009, 19:38
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04 May 2009, 19:38
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15 May 2009, 09:30
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The study of the effects of irradiation damage in superconducting materials is crucial for the twofold aim of helping to understand the nature of superconductivity and of improving the superconducting properties for applications. The main experiments performed on irradiated MgB2 are reviewed and compared with similar experiments performed in the past on A15 superconductors [1]. The suppression of the critical temperature (Tc) with disorder shows in both the kind of superconductors the existence of an universal dependence of Tc on the residual resistivity. The defect structure and the effect of annealing after irradiation are investigated. The behaviours of the upper critical fields, specific heat, resistivity and magnetoresistivity upon irradiation are presented. The experiments of specific heat, tunneling and point contact spectroscopies, which provide an evaluation of the energy gaps as a function of disorder, are summarized. Finally, phenomenological models for the changes in the superconducting properties are discussed.
The overall experimental and theoretical evidences indicate that despite the same BCS coupling, A15s and MgB2 get high Tc values by different features. A15 materials take advantage by the high DOS, whilst, MgB2 presents a rather low DOS and the main ingredients are the high phonon energies and the presence of the two bands. The behaviour of superconducting properties of MgB2 and A15s upon irradiation should reflect these differences and primarily depend on the effect of disorder on these different ingredients. Nevertheless, the comparison between the behaviour of damaged MgB2 and A15s has emphasized both similarities and differences. The differences, as well as the important similarities, arising from the comparison between the behaviour of irradiated MgB2 and A15 samples provide significant indications of an overall understanding of radiation damage in superconducting materials.

[1] M.Putti, R.Vaglio and J.Rowell, Topycal Review Supercon. Sci. Thecnol. 21 043001 (2008)

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