In the present study, we investigate the influence of the hafnium (Hf) impurities on the magnetoresistance of YBa2Cu3O7−δYBa2Cu3O7−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 > Tc)Tc) , the temperature dependence of the excess paraconductivity can be described within the Aslamazov–Larkin theoretical model of the fluctuation conductivity for layered superconductors.
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- Excess conductivity
- YBa2Cu3O7−δYBa2Cu3O7−δ ceramic
- Hf impurities
- 2D–3D crossover
- Coherent length