Title :
Complex AC conductance of YBaCuO films
Author :
Srivastava, P.K. ; Debely, P. ; Hintermann, H.E. ; Leemann, Ch. ; Fluckiger, Ph ; Caccivio, O. ; Gavilano, J.L. ; Weber, J. ; Martinoli, P.
Author_Institution :
CSEM, Neuchatel, Switzerland
fDate :
3/1/1989 12:00:00 AM
Abstract :
The AC linear response of YBaCuO films prepared by RF magnetron sputtering to a small oscillating field was studied as a function of temperature and transverse magnetic field. The structures observed are quite similar to those found in artificially prepared two-dimensional periodic junction arrays where the transition from a phase-ordered to a phase-disordered state at Tc is attributed to the vortex unbinding mechanism predicted by the Kosterlitz-Thouless theory for phase transitions in two dimensions. The magnetic field data suggest that the typical cell size of the YBCO array is a few μm, on the order of the grain size. This suggests that the ceramic films can be modeled as two-dimensional networks of Josephson tunnel junctions, the junctions being located at the grain boundaries
Keywords :
Josephson effect; barium compounds; ceramics; grain boundaries; grain size; high-temperature superconductors; sputtered coatings; superconducting thin films; yttrium compounds; AC linear response; Josephson tunnel junctions; YBaCuO films; cell size; ceramic films; complex AC conductance; grain boundaries; grain size; high temperature superconductivity; small oscillating field; sputtered film; temperature dependence; transverse magnetic field dependence; two-dimensional networks; Conductive films; Grain size; Magnetic fields; Magnetic films; Periodic structures; Phased arrays; Radio frequency; Sputtering; Temperature; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
