Order parameter and current-phase relation in Josephson junctions composed of g+s-wave superconductors

Article

关键词: REVERSAL SYMMETRY-BREAKING;    T-C SUPERCONDUCTORS;    HIGH-TEMPERATURE SUPERCONDUCTORS;    GINZBURG-LANDAU EQUATIONS;    UNCONVENTIONAL SUPERCONDUCTORS;    PAIRING SYMMETRY;    S-WAVE;    CUPRATE SUPERCONDUCTORS;    VORTEX STRUCTURE;    SURFACE-STATES;   

DOI  :  10.1103/PhysRevB.68.184516

来源: SCIE

【 摘 要 】

Based on the analyses of bulk sensitive experimental data on penetration depths, Raman spectra, electron photoemission spectra, etc., G. M. Zhao concluded in a recent paper [Phys. Rev. B 64, 024503 (2001)] that the symmetry of high-T-c superconductors belongs to the g+s-wave type. To explore the common and uncommon features of the g+s-wave pairing state with respect to the d-wave pairing state, both superconductor-insulator-superconductor junction and superconductor-normal metal-superconductor junction have been studied self-consistently in this paper using the quasiclassical theory. The current phase relation for g+s-wave superconductors Delta(s,theta)=Delta(0)(s+cos 4theta) is investigated systematically as functions of s-wave component, crystal orientation angle beta, as well as roughness rho of the interface layer. Our results show that there exists a critical beta(C) for a given s and rho so that the current phase relation approaches asymptotically to I(Phi)=I(C)sin(2Phi) from I(Phi)=I(C)sin(Phi) as beta-->beta(C). The order parameter and beta(C)-s relation are calculated self-consistently as interface roughness varies. Our results are compared with their counterparts in Josephson junctions with the d-wave pairing state obtained using a similar method.

【 授权许可】

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