Josephson Junction with Composite Structure of d-wave and s-wave Superconductors

Shiri Mollaahmad, Zohreh (2017) Josephson Junction with Composite Structure of d-wave and s-wave Superconductors. Masters thesis, University of Mohaghegh Ardabili.

Text (پیوند جوزفسون با ساختار ترکیبی ابررساناهای d-wave و s-wave) Zohreh Shiri Mollaahmad.pdf Download (499kB)

Abstract

High temperaturs superconductors are of most common type of anisotropic superconductors that has pairing symmetry as k_x^2-k_y^2. This pairing symmetry has been confirmed by phase- sensitive josephson weak links. This josephson junctions is made by a weak link between a d-wave superconductor and two s-wave superconductors that are orthognal in crystal ac and bc faces. Because of π- phase shift between weak links, vortex current flowes in the corners of d-wave superconductor that connected to s-wave superconductor. This is occurs even when the external magnetic field is zero, this issue is very important. In this thesis, we have studied the notion of such a system and we have reviewed the size of the tunneling current for different geometries corner and edge Josephson junctions in the s-wave and d-wave states and have obtained the effect of temperature and external magnetic field on the Josephson current. Also we have study effect of the magnetic field on the vortex current and finally have obtain the current-voltage characteristics of this system.

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