Explanation of small IcRn values observed in inhomogeneous superconductors
Abstract
For an inhomogeneous high- Tc superconductor, band-filling dependence of Josephson IcRn product is deduced at T=0 K by means of measurement; this is an extension of the Ambegaokar-Baratoff (AB) theory based on the s-wave theory. The product is given by J obsR n≡ {π}/{2}ρΔ i=ρJ iR n, where 0< ρ⩽1 is band filling (or local density), and Δi is the intrinsic superconducting true gap and small. When ρ=1, JobsRn= JiRn is the intrinsic Josephson true product (or the AB product), where Ji is the intrinsic Josephson true current occurring by Cooper pair. When 0< ρ<1, JobsRn is an average of JiRn over the measurement region and is the effect of measurement. The JobsRn explains small IcRn values observed by experiments. Furthermore, the intrinsic true gap, 8.5< Δi<17 meV, is analyzed from IcRn data of Bi 2Sr 2CaCu 2O 8+ x. d-wave superconductive components do not exist in Bi-2212 crystals.
- Publication:
-
Physica C Superconductivity
- Pub Date:
- November 2003
- DOI:
- 10.1016/S0921-4534(03)01293-0
- arXiv:
- arXiv:cond-mat/0306421
- Bibcode:
- 2003PhyC..399...48K
- Keywords:
-
- 74.20.Fg;
- 74.50.+r;
- BCS theory and its development;
- Tunneling phenomena;
- point contacts weak links Josephson effects;
- Condensed Matter - Superconductivity
- E-Print:
- 4 Pages, 4 Figures