Explanation of small I_{c}R_{n} values observed in inhomogeneous superconductors
Abstract
For an inhomogeneous high T_{c} superconductor, bandfilling dependence of Josephson I_{c}R_{n} product is deduced at T=0 K by means of measurement; this is an extension of the AmbegaokarBaratoff (AB) theory based on the swave theory. The product is given by J _{obs}R _{n}≡ {π}/{2}ρ∆ _{i}=ρJ _{i}R _{n}, where 0< ρ⩽1 is band filling (or local density), and ∆_{i} is the intrinsic superconducting true gap and small. When ρ=1, J_{obs}R_{n}= J_{i}R_{n} is the intrinsic Josephson true product (or the AB product), where J_{i} is the intrinsic Josephson true current occurring by Cooper pair. When 0< ρ<1, J_{obs}R_{n} is an average of J_{i}R_{n} over the measurement region and is the effect of measurement. The J_{obs}R_{n} explains small I_{c}R_{n} values observed by experiments. Furthermore, the intrinsic true gap, 8.5< ∆_{i}<17 meV, is analyzed from I_{c}R_{n} data of Bi _{2}Sr _{2}CaCu _{2}O _{8+ x}. dwave superconductive components do not exist in Bi2212 crystals.
 Publication:

Physica C Superconductivity
 Pub Date:
 November 2003
 DOI:
 10.1016/S09214534(03)012930
 arXiv:
 arXiv:condmat/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
 EPrint:
 4 Pages, 4 Figures