C. Camerlingo et al., EFFECT OF VORTEX-PAIR FLUCTUATIONS ON ZERO-FIELD CURRENT-VOLTAGE CHARACTERISTICS OF YBCO FILMS, Physica. C, Superconductivity, 282, 1997, pp. 2011-2012
The current-voltage characteristics of YBCO films were investigated on
both c-axis and a/b axis oriented samples. The films, about 100 nm th
ick, were fabricated by inverted cylindrical de magnetron sputtering o
n (100) and (110) SrTiO3 substrates. In c-axis oriented films the obse
rved behavior is consistent with a model based on two-dimensional pair
vortex fluctuations in the CuO2 planes. Preliminary measurements on t
he a/b axis oriented samples are reported, for different angles betwee
n incident bias current and c-axis planes.