Development of macroturbulent instability in a YBCO single crystal

An experimental study of macroturbulence in a superconducting YBCO single crystal is carried out. This macroturbulent instability arises upon a change of sign of the external magnetic field, resulting in the formation of a magnetization-reversal front, which divides the sample into regions occupied...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2009-08, Vol.35 (8), p.627-631
Main Authors: Voloshin, I. F., Kalinov, A. V., Fisher, L. M., Yampol’skii, V. A., Bobyl, A., Johansen, T. H.
Format: Article
Language:English
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Summary:An experimental study of macroturbulence in a superconducting YBCO single crystal is carried out. This macroturbulent instability arises upon a change of sign of the external magnetic field, resulting in the formation of a magnetization-reversal front, which divides the sample into regions occupied by vortices with opposite orientation (vortices and antivortices). The measurements are made by magnetooptical methods at a temperature of 40 K . It is found that the development time of the macroturbulence depends substantially on the value of the external magnetic field H . With increasing H the macroturbulent process, which is accompanied by annihilation of vortices and antivortices, is accelerated on account of enhancement of the magnetic flux creep.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.3224718