Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Andreev Reflection and Long-Range Proximity Effect in Pb/LaCaMnO Point
  Contacts   The 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.

15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys