Andreev Reflection and Long-Range Proximity Effect in Pb/LaCaMnO Point Contacts

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dc.creatorKrivoruchko, V. N.
dc.creatorTarenkov, V. Yu.
dc.creatorD'yachenko, A. I.
dc.creatorVaryukhin, V. N.
dc.date2005-11-16
dc.date.accessioned2026-07-07T06:46:09Z
dc.date.available2026-07-07T06:46:09Z
dc.descriptionThe Andreev reflection (AR) spectroscopy has been used to probe mutual influence of superconducting pairing and ferromagnetic correlations in contacts of low-temperature superconductor (S), Pb, and half-metallic ferromagnetic, La0.65Ca0.35MnO3(LCMO). Two different AR spectra have been observed. In the contacts without proximity effect, the AR spectra reveal a behavior typical for superconductor/spin-polarized metal contacts. In the contacts, which we distinguish as the proximity affected ones, a few unusual effects have been detected. Namely, we have observed: (i) a spectacular drop in the resistance of the contacts at the onset of the Pb superconductivity; (ii) a typical for S/normal nonmagnetic metal contacts, excess current and doubling of the normal-state conductance; and (iii) a much larger than it should be for conventional superconductivity ratio of the single-particle gap to the Pb superconducting transition temperature. The very distinct AR characteristics of proximity affected contacts observed by us suggest unconventional (triplet) superconducting pairing and long-range proximity effect at S/LCMO interface.
dc.description11 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0511387
dc.identifierhttp://arxiv.org/abs/cond-mat/0511387
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/103246
dc.subjectSuperconductivity
dc.titleAndreev Reflection and Long-Range Proximity Effect in Pb/LaCaMnO Point Contacts
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