Journal of Superconductivity

, Volume 6, Issue 4, pp 243–246 | Cite as

Flux-creep activation energies at the grain boundaries of Y-Ba-Cu-O superconductors in the characteristic frequency band

  • A. C. Bódi
  • I. Kirschner
Articles

Abstract

Measurements on the temperature and frequency dependence of the complex ac susceptibility of sintered Y1.01Ba1.95Cu2.97O x are reported. The data are used to obtain the flux-creep activation energies at the grain boundaries in the characteristic frequency band. The found nonlinear frequency dependence of these energies can be approximated differently in the low, characteristic, and high frequency bands. The relaxation frequency of thermal fluctuation of the vortex lattice (2πΓ ∼ 3×104 Hz) and the surface current density (Js=0–10 A/cm2) have been estimated.

Key words

High-temperature superconductivity flux pinning flux motion 

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • A. C. Bódi
    • 1
  • I. Kirschner
    • 2
  1. 1.Institute of Experimental PhysicsKossuth UniversityDebrecenHungary
  2. 2.Department of Low-Temperature PhysicsEötvös UniversityBudapestHungary

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