Quasiclassical Green's function theory of the Josephson effect in chiral pwave superconductor/diffusive normal metal/chiral pwave superconductor junctions
Sawa, Y. and Yokoyama, T. and Tanaka, Y. and Golubov, A.A. (2007) Quasiclassical Green's function theory of the Josephson effect in chiral pwave superconductor/diffusive normal metal/chiral pwave superconductor junctions. Physical Review B: Condensed matter and materials physics, 75 (13). p. 134508. ISSN 10980121

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Abstract:  We study the Josephson effect in chiral pwave superconductor/diffusive normal metal (DN)/chiral pwave superconductor (CP/DN/CP) junctions using quasiclassical Green's function formalism with proper boundary conditions. The px+ipywave symmetry of superconducting order parameter is chosen which is believed to be the pairing state in Sr2RuO4. We show that the superconducting pair amplitude induced in DN has an oddfrequency spintriplet swave symmetry and is an odd function of Matsubara frequency. Despite the peculiar symmetry properties of the Cooper pairs, the behavior of the Josephson current is rather conventional. We have found that the currentphase relation is almost sinusoidal and the Josephson current is proportional toexp(−L/xi), where xi is the coherence length in DN and L is the thickness of the DN layer. We also calculate the Josephson current in CP/diffusive ferromagnet metal/CP junctions and show that the 0pi transition can be realized by varying temperature or thickness L similar to the case of conventional swave junctions. The obtained results may help to explore the properties of superconducting state in Sr2RuO4. 
Item Type:  Article 
Copyright:  © 2007 American Physical Society 
Faculty:  Science and Technology (TNW) 
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Link to this item:  http://purl.utwente.nl/publications/59121 
Official URL:  http://dx.doi.org/10.1103/PhysRevB.75.134508 
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Metis ID: 242708