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Title: Critical state and low-field electrodynamics in LaO{sub 0.85}F{sub 0.15}FeAs superconductor polycrystals

The penetration of a weak magnetic field into LaO{sub 0.85}F{sub 0.15}FeAs 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [1] ; ;  [2]
  1. National Research Centre “Kurchatov Institute,”, Petersburg Institute of Nuclear Physics (Russian Federation)
  2. Belarus State University (Belarus)
  3. Palacky University (Czech Republic)
  4. Okan University (Turkey)
Publication Date:
OSTI Identifier:
22472219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 6; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CERAMICS; CRITICAL CURRENT; ELECTRIC CONDUCTIVITY; ELECTRODYNAMICS; IRON ARSENIDES; LANTHANUM FLUORIDES; LANTHANUM OXIDES; MAGNETIC FIELDS; MAGNETIZATION; NONLINEAR PROBLEMS; POLYCRYSTALS; SUPERCONDUCTORS; TEMPERATURE DEPENDENCE