In the present study, we investigate the influence of the hafnium (Hf) impurities on the magnetoresistance of $\hbox {YBa}_{2}\hbox {Cu}_{3}\hbox {O}_{7-δ }$ YBa2Cu3O7-δ ceramic samples in the temperature interval of the transition to the superconducting state in constant magnetic field up to 12 T. The cause of the appearance of low- temperature “tails” (paracoherent transitions) on the resistive transitions, corresponding to different phase regimes of the vortex matter state is discussed. At temperatures higher than the critical temperature (T > $T_\mathrm{c})$ Tc) , the temperature dependence of the excess paraconductivity can be described within the Aslamazov–Larkin theoretical model of the fluctuation conductivity for layered superconductors.