Measurements of Stationary Josephson Current between High-$T_c$ Oxides as a Tool to Detect Charge Density Waves

Abstract

Stationary Josephson tunnel current $I_c$ between superconductors with $d$-wave order parameter symmetry and charge-density-wave (CDW) partial gapping was analyzed in the two-dimensional model appropriate to high-$T_c$ cuprates. It was shown that, in certain experimental setups, due to the peculiar overlap of superconducting and CDW gaps in the momentum space, the dependence of $I_c$ on the CDW parameters may be strongly nonmonotonic. Hence, we suggested that $I_c$ measurements in the wide range of dopings can serve as an indicator of CDW existence in the pseudogap regions of the cuprate phase diagrams. Besides, the orientation $I_c$-dependences were analyzed.

23 pages, 10 figures