Theory of c-axis Josephson tunneling in d-wave superconductors
arXiv:cond-mat/0301280 · doi:10.1103/PhysRevB.67.020510
Abstract
The temperature and angular dependence of the c-axis Josephson current and the superfluid density in layered d-wave superconductors are studied within the framework of an extended Ambegaokar-Baratoff formalism. In particular, the effects of angle-dependent tunneling matrix elements and Andreev scattering at grain boundaries are taken into account. These lead to strong corrections of the low-temperature behavior of the plasma frequency and the Josephson current. Recent c-axis measurements on the cuprate high-temperature superconductors HgBa_2CaCu_{1+δ} and Bi_2Sr_2CaCu_2O_{8+δ} can therefore be interpreted to be consistent with a d-wave order parameter.
Revtex, 4 pages with 4 eps figures, to appear in PRB RC