Low-temperature Josephson current peak in junctions with d-wave order parameters

Richard A. Riedel; Philip F. Bagwell

doi:10.1103/PhysRevB.57.6084

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Low-temperature Josephson current peak in junctions with d-wave order parameters

Richard A. Riedel, Philip F. Bagwell

DOI 10.1103/PhysRevB.57.6084 · Physical Review B

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Abstract

A low-temperature peak in the critical current of Josephson junctions containing d-wave order parameters (D) was recently found by Barash et al. [Phys. Rev. Lett. 77, 4070 (1996)]. We point out that the height and width of this low-temperature peak is limited by the transmission coefficient T through the insulator (I) separating the two superconductors. In planar DID junctions the width of the Josephson current peak in temperature is TTc and its height is IcRn=πΔ/eT. In SID junctions, where S is an ordinary s-wave superconductor, the corresponding low-temperature peak in the Josephson current has a width in temperature TTc and a height IcRn=πΔ/e. Both the height and width of the low-temperature Josephson current peak follow from the bound Andreev-level spectrum in SID and DID junctions. Interface roughness and suppression of the order parameter near the interface will also affect the height and width of the low-temperature peak.