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IRREVERSIBLE BEHAVIOUR OF ORIENTED GRAINED YBCO(X). 1. TRANSPORT AND SHIELDING CURRENTS.

Author(s) : KELLER C.

Type of article: Article

Summary

THE CRITICAL CURRENT OF ORIENTED GRAINED YBCO(X) BULK MATERIAL WAS INVESTIGATED BY RESISTIVE TRANSPORT AND INDUCTIVE FLUX PROFILE MEASUREMENTS. THE APPLIED MAGNETIC FIELD WAS DIRECTED PARALLEL AND PERPENDICULAR TO THE A-B PLANE. NO FEATURES OF GRANULARITY COULD BE DETECTED IF THE INDUCED SHIELDING CURRENT DIRECTED ALONG THE C-AXIS PASSED GRAIN BOUNDARIES. THE COMPARISON OFSHIELDING AND TRANSPORT CURRENTS FURTHER RULED OUT THE EXISTENCE OF INTRAGRAIN JUNCTIONS. THE OBSERVATION OF A TEMPERATURE SCALING LAW FOR THE VOLUME PINNING FORCE ALLOWS COMPARISON OF THE PINNING STRENGTHS IN BOTH GEOMETRIES. THE VOLUMEPINNING FORCE IS FOUND TO BE ABOUT ONE ORDER OF MAGNITUDE LARGER IF THE MAGNETIC FIELD IS PARALLEL TO THE TWIN PLANES. DISCUSSION ON THE ORIGIN OF PINNING IN THE CASE OF BOTH GEOMETRIES.

Details

  • Original title: IRREVERSIBLE BEHAVIOUR OF ORIENTED GRAINED YBCO(X). 1. TRANSPORT AND SHIELDING CURRENTS.
  • Record ID : 1991-1961
  • Languages: English
  • Source: Cryogenics - vol. 30 - n. 5
  • Publication date: 1990

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