Physics – Condensed Matter – Superconductivity
Scientific paper
2007-10-17
Phys. Rev. B 77(6), 064521(2008)
Physics
Condensed Matter
Superconductivity
10 pages 3 Figs; some misprints in fromulae corrected; submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.064521
We consider a magnetic superconductor MS with a spiral magnetic structure. On the basis of generalized Eilenberger and Usadel equations we show that near the boundary of the MS with an insulator or vacuum the condensate (Gor'kov's) Green's functions are disturbed by boundary conditions and differ essentially from their values in the bulk. Corrections to the bulk quasiclassical Green's functions oscillate with the period of the magnetic spiral, $2\pi /Q$, and decay inside the superconductor over a length of the order $v/\pi T$ (ballistic limit) or $\sqrt{D/\pi T}$ (diffusive limit). We calculate the dc Josephson current in an MS/I/MS tunnel junction and show that the critical Josephson current differs substantially from that obtained with the help of the tunnel Hamiltonian method and bulk Green's functions.
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