Journal of Experimental and Theoretical Physics

, Volume 120, Issue 6, pp 1034–1040 | Cite as

Critical state and low-field electrodynamics in LaO0.85F0.15FeAs superconductor polycrystals

  • O. V. Gerashchenko
  • A. L. Kholmetskii
  • M. Mashlan
  • T. Yarman
  • A. V. Aldushchenkov
  • I. S. Okunev
  • V. A. Lomonosov
  • L. V. Makhnach
Order, Disorder, and Phase Transition in Condensed System

Abstract

The penetration of a weak magnetic field into LaO0.85F0.15FeAs polycrystalline superconductors is investigated using two mutually complementing techniques: measurement of the higher harmonics of nonlinear magnetization and the current-voltage characteristics. The dependences of the critical current density and resistivity on the temperature and magnetic field strength are determined. The results confirm the theory of the critical state in the low-field electrodynamics of a Josephson medium. The universality of this theoretical concept is demonstrated for a new class of ceramic superconductors.

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Copyright information

© Pleiades Publishing, Inc. 2015

Authors and Affiliations

  • O. V. Gerashchenko
    • 1
  • A. L. Kholmetskii
    • 2
  • M. Mashlan
    • 3
  • T. Yarman
    • 4
  • A. V. Aldushchenkov
    • 1
  • I. S. Okunev
    • 1
  • V. A. Lomonosov
    • 2
  • L. V. Makhnach
    • 2
  1. 1.Petersburg Institute of Nuclear PhysicsNational Research Centre “Kurchatov Institute,”Gatchina, Leningradskaya oblastRussia
  2. 2.Belarus State UniversityMinskRepublic of Belarus
  3. 3.Palacky UniversityOlomoucCzech Republic
  4. 4.Okan UniversityAkfirat Beldesi, IstanbulTurkey

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