Theory of the proximity effect in junctions with unconventional superconductors

Abstract

We present a general theory of the proximity effect in junctions between diffusive normal metals (DN) and unconventional superconductors in the framework of the quasiclassical Green's function formalism. Various possible symmetry classes in a superconductor are considered which are consistent with the Pauli principle: even-frequency spin-singlet even-parity (ESE) state, even-frequency spin-triplet odd-parity (ETO) state, odd-frequency spin-triplet even-parity (OTE) state and odd-frequency spin-singlet odd-parity (OSO) state. For each of the above four cases symmetry and spectral properties of the induced pair amplitude in the DN are determined. It is shown that the pair amplitude in a DN belongs respectively to an ESE, OTE, OTE and ESE pairing state.

5 pages with one figure

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• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Triplet proximity effect in FSF trilayers
• Anomalous Josephson effect in p-wave dirty junctions

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