Suppression of the order–disorder transition in Ti-doped YBaCuO compounds

The influence of titanium impurities on the magnetoresistance of YBa\(_2\)Cu\(_3\)O\(_{7-\delta }\) ceramics near the superconducting transition is investigated in magnetic fields up to 7 T. The mechanisms for low-temperature resistance “tails” (paracoherent transitions) to appear are discussed in the context of different states of vortex matter in the samples. At temperatures above \(T_c\), the temperature dependence of the excess conductivity is satisfactory described within the framework of the Aslamazov–Larkin model for the fluctuation conductivity of layered superconductors.