Premium
Josephson Tunneling Critical Current between Superconductors with Charge‐ or Spin‐Density Waves
Author(s) -
Gabovich A. M.,
Moiseev D. P.,
Shpigel A. S.,
Voitenko A. I.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221610129
Subject(s) - condensed matter physics , superconductivity , quantum tunnelling , josephson effect , pi josephson junction , current density , dielectric , charge density wave , physics , electron , materials science , optoelectronics , quantum mechanics
The temperature dependences are calculated of the critical current I c across a symmetrical tunnel Josephson junction between superconductors with partial electron spectrum dielectrization. The dielectric pairing is considered to be either singlet (charge‐density wave) or triplet (spin‐density wave). The dependences of the superconductivity gap Δ and I c on T do not differ substantially from the well‐known Mühlschlegel and Ambegaokar‐Baratoff curves. The current I c falls rapidly when the dielectric gap ∑ increases and the ratio ν ≡ N nd (0)/ N d (0) decreases. Here N nd ( N d ) is the electron state density on the non‐dielectrized (dielectrized) Fermi surface section. The values j c of the critical current density for the bulk Josephson samples of ceramics BaPb 1− x Bi x O 3 with x = 0.15, 0.25, 0.3, and current—voltage characteristics of the tunnel type are measured. The quantity j c drops sharply when x increases, i.e. when the dielectrization degree increases (ν decreases).