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Spin-active interfaces and unconventional pairing in half-metal/superconductor junctions

Linder, Jacob; Cuoco, Mario; Sudbø, Asle
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2455023
Date
2010
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  • Institutt for fysikk [1807]
  • Publikasjoner fra CRIStin - NTNU [20888]
Original version
Physical Review B. Condensed Matter and Materials Physics. 2010, 81 (17), .   10.1103/PhysRevB.81.174526
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.
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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