Phys. Rev. Lett. 98, 037003 (2007) [4 pages]Theory of the Proximity Effect in Junctions with Unconventional SuperconductorsReceived 9 June 2006; published 16 January 2007 We present a general theory of the proximity effect in junctions between diffusive normal metals (DN) and superconductors. Various possible symmetry classes in a superconductor are considered: even-frequency spin-singlet even-parity (ESE) state, even-frequency spin-triplet odd-parity state, odd-frequency spin-triplet even-parity (OTE) state and odd-frequency spin-singlet odd-parity state. It is shown that the pair amplitude in a DN belongs, respectively, to an ESE, OTE, OTE, and ESE pairing state since only the even-parity s-wave pairing is possible due to the impurity scattering. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.037003
DOI:
10.1103/PhysRevLett.98.037003
PACS:
74.45.+c, 74.20.Rp, 74.50.+r
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