In-plane paraconductivity of ReBa2Cu3O7-d (Re=Y, Ho) single crystals with a given topology of planar defects and a mono-domain sample

Abstract

In this experimental study we present a comparative analysis between the normal and the fluctuating conductivity of the ReBa2Cu3O7-d (Re=Y, Ho) single crystals (with a given topology of plane defects) and a mono-domain sample (without twin boundaries). It is demonstrated that the twin boundaries are efficient scattering centers for the normal and fluctuating carriers. The Lawrence-Doniach theoretical model is an appropriate description of the temperature dependence of the excess conductivity. The values of the coherence length perpendicular to the ab-plane Xc (0) are in good agreement with the values derived from magnetic measurements of stoichiometric YBa2Cu3O7-d single crystals.