Effect of transparency on Josephson junction between s+g-wave superconductors

doi:10.1088/1674-1056/19/10/107303

摘要/Abstract

摘要： In this paper, a dc Josephson junction between borocarbide superconductors has been studied theoretically. The s+g-wave pairing symmetry which is observed in rare earth complex of borocarbides has a huge anisotropy and is an interesting form of unconventional superconductivity. We calculate the Josephson current in a superconductor--insulator--superconductor (SIS) Josephson junction with s+g-wave superconducting pairing symmetry. In our planar junction c-axis is parallel to an interface with finite transparency but ab-planes of two tetragonal superconductors are misorientated by angle α. We obtain that the Josephson current is strongly dependent on mis-orientation between the left and the right ab-planes. An insulator sandwiched between two superconductors which acts as a potential barrier is demonstrated by a transparency coefficient. The effects of the potential barrier and the mis-orientation on the current are studied analytically and numerically. Occurrence of 0--π transition in this s+g-wave junction is investigated in this paper. A comparison between d-wave Josephson junction and s+g-wave one is also made in the present paper.

Abstract: In this paper, a dc Josephson junction between borocarbide superconductors has been studied theoretically. The s+g-wave pairing symmetry which is observed in rare earth complex of borocarbides has a huge anisotropy and is an interesting form of unconventional superconductivity. We calculate the Josephson current in a superconductor–insulator–superconductor (SIS) Josephson junction with s+g-wave superconducting pairing symmetry. In our planar junction c-axis is parallel to an interface with finite transparency but ab-planes of two tetragonal superconductors are misorientated by angle $\alpha$. We obtain that the Josephson current is strongly dependent on mis-orientation between the left and the right ab-planes. An insulator sandwiched between two superconductors which acts as a potential barrier is demonstrated by a transparency coefficient. The effects of the potential barrier and the mis-orientation on the current are studied analytically and numerically. Occurrence of 0–$\pi$ transition in this s+g-wave junction is investigated in this paper. A comparison between d-wave Josephson junction and s+g-wave one is also made in the present paper.

Key words: Josephson junction, unconventional superconductor, borocarbides

中图分类号: (Theories and models of superconducting state)

74.20.-z

74.25.Jb (Electronic structure (photoemission, etc.)) 74.50.+r (Tunneling phenomena; Josephson effects) 74.72.-h (Cuprate superconductors) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Gholamreza Rashedi. Effect of transparency on Josephson junction between s+g-wave superconductors[J]. 中国物理B, 2010, 19(10): 107303-107303.

Gholamreza Rashedi. Effect of transparency on Josephson junction between s+g-wave superconductors[J]. Chin. Phys. B, 2010, 19(10): 107303-107303.

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