Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions (Articolo in rivista)

Type
Label
  • Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.81.174526 (literal)
Alternative label
  • 1 Linder, J;2,3 Cuoco, M; 1 Sudbo, A (2010)
    Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • 1 Linder, J;2,3 Cuoco, M; 1 Sudbo, A (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://prb.aps.org/abstract/PRB/v81/i17/e174526 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 81 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1 Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway 2 CNR-SPIN, Fisciano, I-84084 Salerno, Italy 3 Dipartimento di Fisica E.R. Caianiello, Universitá di Salerno, Fisciano, I-84084 Salerno, Italy (literal)
Titolo
  • Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions (literal)
Abstract
  • We study the physical properties of a half-metallic ferromagnet? superconductor ?HM?S? bilayer, allowing for an arbitrary bulk pairing symmetry of the superconductor and spin-dependent processes at the interface. In particular, we study how the possibility of unconventional pairing such as p- and d-wave and a spin-active interface influence the ?i? conductance spectra, ?ii? proximity effect, and ?iii? local density of states of such a bilayer. Our calculation is done both analytically and numerically in the ballistic limit, using both a continuum and lattice model. It is found that the spin-dependent phase shifts occurring at the HM?S interface seriously influence all of the aforementioned phenomena. We explain our results in terms of Andreev reflection in the presence of a spin-active interface, allowing for both spin-filtering and spin-mixing processes. We demonstrate how the surface bound states induced by the anisotropy of the superconducting order parameter at the HM?S interface are highly sensitive to these spin-dependent processes. Our results can be directly tested experimentally using scanning tunnel microscope measurements and/or point-contact spectroscopy. (literal)
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