On the contribution of the superconductor to the resistance of a superconductor-normal metal system

✍ Scribed by S. N. Artemenko; A. F. Volkov; A. V. Zaitsev

• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 515 KB
• Volume: 30
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00114963

✦ Synopsis

The problem of dc current flow through a superconductor-normal metal interface near the critical temperature Tr is considered. The equations for the Green's functions integrated with respect to the variable ~ = v(p-P0) are used to calcuate the resistance of the pure and dirty superconductor S. It is shown that the electric field E decays exponentially over a length lb = (D%4T / ~r A ) 1/2 within the superconductor and at the S-N interface there is a jump of E [strictly speaking, E varies over the correlation length ~(T)]; here D is the diffusion coefficient, and % is the energy relaxation time. The magnitude of the jump of E is of the order of or less than the value of E at the boundary of the S region. In the case of a pure superconductor this jump is caused by the Andreev reflection of quasiparticles at the S-N interface.