Lb. Stahel et al., CRITICAL DYNAMIC SCALING OF THE VORTEX-GLASS TO VORTEX LIQUID-PHASE TRANSITION IN SUPERCONDUCTING YBA2CU3O7-DELTA THIN-FILMS, Physica. C, Superconductivity, 235, 1994, pp. 2665-2666
The vortex-glass to vortex-liquid transition has been investigated by
measuring the linear complex sc impedance of c-axis oriented YBa2Cu3O7
-delta (YBCO) thin films exposed to a magnetic field H parallel to the
c-axis using a two coil mutual inductance technique. An analysis of t
he films frequency- and temperature-dependent resistance R(w,T) and in
ductance L(w,T) in terms of dynamic scaling in three dimensions provid
es strong evidence for a genuine continuous phase transition. Regardle
ss of the value of H, we find the static (v) and dynamic (z) critical
exponents v = 2.0 +/- 0.5 and z = 5.5 +/- 1.0, in good agreement with
values inferred from other studies of YBCO thin films, but distinctive
ly larger than those reported for single crystals.