Physics – Condensed Matter – Superconductivity
Scientific paper
2006-10-08
J. Low Temp. Phys. 147, 457, 2007
Physics
Condensed Matter
Superconductivity
20 pages, 5 figures, added citations, corrected typos
Scientific paper
10.1007/s10909-007-9329-6
Using selection rules imposed by the Pauli principle, we classify pairing correlations according to their symmetry properties with respect to spin, momentum, and energy. We observe that inhomogeneity always leads to mixing of even- and odd-energy pairing components. We investigate the superconducting pairing correlations present near interfaces between superconductors and ferromagnets, with focus on clean systems consisting of singlet superconductors and either weak or half-metallic ferromagnets. Spin-active scattering in the interface region induces all of the possible symmetry components. In particular, the long-range equal-spin pairing correlations have odd-frequency s-wave and even-frequency p-wave components of comparable magnitudes. We also analyze the Josephson current through a half-metal. We find analytic expressions and an interesting universality in the temperature dependence of the critical current in the tunneling limit.
Champel Thierry
Cuevas Juan Carlos
Eschrig Matthias
Kopu Juha
Lofwander Tomas
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