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
Savich, S. V., Samoylov, A. V., Kamchatnaya, S. N., Goulatis, I. L., Vovk, R. V., Chroneos, A., ... Omelchenko, L. V. (2016). Effect of Hafnium Impurities on the Magnetoresistance of YBa2Cu3O7−δ. Journal of Low Temperature Physics, (in press). https://doi.org/10.1007/s10909-016-1703-9