Nonstationary Josephson effect for superconductors with charge-density waves
- Crystal Physics Department, Institute of Physics, National Academy of Sciences, 252650 Kiev-22 GSP, prospekt Nauki 46 (Ukraine)
The nonstationary Josephson I{sup 1}, interference I{sup 2}, and quasiparticle J currents through symmmetrical and nonsymmetrical tunnel junctions involving superconductors with charge-density waves (CDW`s) were calculated. In the symmetrical (s) case the voltage V dependence of the Josephson current I{sub s}{sup 1}(V) has logarithmic singularities at {vert_bar}eV{vert_bar}=2{Delta}, {Delta}+D, and 2D, where D={radical}(({Delta}{sup 2}+{Sigma}{sup 2})), {Delta} is the superconducting order parameter, {Sigma} is the dielectric order parameter, and e is the elementary charge. For temperatures T{ne}0 the jump at a bias {vert_bar}eV{vert_bar}=D{minus}{Delta} emerges in I{sub s}{sup 1}(V). The I{sub s}{sup 2}(V) and J{sub s}(V) possess jumps and singularities at the same biases where singularities and jumps occur in I{sub s}{sup 1}(V). For the nonsymmetrical (ns) junctions, which include also the ordinary superconductor, singularities and jumps appear at biases {vert_bar}eV{vert_bar}=D+{Delta}{sub BCS}, {Delta} +{Delta}{sub BCS}, and (for T{ne}0) {vert_bar}D{minus}{Delta}{sub BCS}{vert_bar} and {vert_bar}{Delta}{minus}{Delta}{sub BCS}{vert_bar}. Here {Delta}{sub BCS} is the superconducting order parameter of the ordinary superconductor. The quasiparticle current J{sub ns} is an asymmetrical function of the voltage V and depends on the sign of {Sigma}. The theory describes the properties of NbSe{sub 3} and high-T{sub c} oxides. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 470847
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Absence of pseudogap in heavily overdoped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+delta} from tunneling spectroscopy of break junctions.
Tunneling spectroscopy of normal metals with charge-density or spin-density waves