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VOLUME 57 (1993) | ISSUE 1 | PAGE 43
Change in the sign of the fluctuational Hall conductivity of YBa2Cu307-δ epitaxial films
The Hall and longitudinal resistances pxy and pxx of YBa2Cu307_5 epitaxial films have been measured at 80<Г<185 К. The fluctuational component of the Hall conductivity crxy= px/(ply+ plx) changes sign at Τ > Tc. Recent theoretical studies indicate that this change may signify a change in the sign of an imaginary part of the relaxation time of the order parameter.