Nonstationary Josephson effect for superconductors with spin-density waves

The nonstationary Josephson I-1, interference I-2, and quasiparticle J current amplitudes through symmetrical and nonsymmetrical (ns) tunnel junctions involving partially dielectrized (partially gapped) superconductors with spin-density waves (SDW's) and described by the dielectric order parameter Sigma were calculated. Riedel-type singularities and jumps for all currents are determined by superconducting order parameter Delta, as well as Sigma. II was shown that each current for symmetrical junctions, made up of thermodynamically! identical SDW superconductors (with /Sigma(left)/=/Sigma(right)/), can exhibit three possible current-voltage characteristics (CVC's) depending on the relationship between the electrodes' Sigma signs:in the course of experiment: (i) one symmetrical CVC for genuinely symmetrical configuration (s) when the dielectric order parameters Sigma(left) and Sigma(right) have the same sign for both electrodes and (ii) two nonsymmetrical ones for symmetrical junction in the state of broken symmetry (bs) when Sigma(left) and Sigma(right) are opposite in sign. The actual setup choice is at random. Thus, the symmetrical junctions can serve as phase-sensitive indicators for the SDW's. The ns junctions which include SDW and ordinary BCS superconductors are also studied. The current amplitudes I-ns(1,2) and J(ns) are asymmetrical functions of the voltage V and depend on the sign of Sigma. Our: calculations reveal main features appropriate to CVC's of tunnel junctions involving the heavy-fermion SDW superconductor URu2Si2. [SO163-1829(99)03742-X].