Physics – Condensed Matter – Superconductivity
Scientific paper
2011-10-26
Solid State Commun. 152, pp. 119-122 (2012)
Physics
Condensed Matter
Superconductivity
13 pages; 3 figures; typos are corrected in v3; submitted to Solid State Communications
Scientific paper
10.1016/j.ssc.2011.10.028
Detailed temperature dependence of both superconducting gaps was obtained directly by means of SnS-Andreev spectroscopy. The \Delta \sigma,\pi(T) -curves were shown to be deviated from standard BCS-like behavior, due to k-space proximity effect between \sigma - and \pi - condensates, which could give a key to experimental determination of interband electron-phonon coupling constants. For the first time, an excellent qualitative agreement with theoretical predictions of Nicol and Carbotte, and Moskalenko and Suhl was shown. dI(V)/dV-spectra of SnS-Andreev contacts based on MgB2 samples (with defects of crystal structure), and Mg(Al)B2 polycrystalline samples (with the local critical temperatures Tc variation 10 K < Tc < 37 K) were studied by means of the "break-junction" technique within the temperature range 4.2 K < T < Tc.
Krasnosvobodtsev S. I.
Kuzmichev S. A.
Shanygina T. E.
Tchesnokov S. N.
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