We study theoretically the Josephson effect in d-wave superconductor / diffusive normal metal /insulator/ diffusive normal metal/ d-wave superconductor (D/DN/I/DN/D) junctions. This model is aimed to describe practical junctions in high-TC cuprate superconductors, in which the product of the critical Josephson current (IC) and the normal state resistance (R) (the so-called ICR product) is very small compared to the prediction of the standard theory. We show that the ICR product in D/DN/I/DN/D junctions can be much smaller than that in d-wave superconductor / insulator / d-wave superconductor junctions and formulate the conditions necessary to achieve large ICR product in D/DN/I/DN/D junctions. The proposed theory describes the behavior of ICR products quantitatively in high-TC cuprate junctions.
@article{arxiv.0704.3126,
title = {A quantitative model for IcR product in d-wave Josephson junctions},
author = {T. Yokoyama and Y. Sawa and Y. Tanaka and A. A. Golubov and A. Maeda and A. Fujimaki},
journal= {arXiv preprint arXiv:0704.3126},
year = {2009}
}