Effect of Hafnium Impurities on the Magnetoresistance of YBa2Cu3O7−δ

S. V. Savich, A. V. Samoylov, S. N. Kamchatnaya, I. L. Goulatis, R. V. Vovk, Alexander Chroneos, A. L. Solovjov, L. V. Omelchenko

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    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.
    Original languageEnglish
    JournalJournal of Low Temperature Physics
    Volume(in press)
    Publication statusPublished - 21 Nov 2016

    Bibliographical note

    This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.


    • Excess conductivity
    • YBa2Cu3O7−δYBa2Cu3O7−δ ceramic
    • Hf impurities
    • Pinning
    • 2D–3D crossover
    • Coherent length


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