Title :
Mapping of magnetic force and field distribution of melt-textured Y-Ba-Cu-O
Author :
Lehndorff, B. ; Kurschner, H.-G. ; Piel, H.
Author_Institution :
Inst. for Materialwissenschaften, Bergische Univ., Wuppertal, Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
Melt-textured YBa/sub 2/Cu/sub 3/O/sub 7-x/-bulk material has been prepared by a modified LPP-process. The samples have been characterized by optical microscopy, electron microscopy (SEM) and energy dispersive X-ray diffraction (EDX). An inductive method was used to determine critical current density J/sub c/ and transition temperature T/sub c/. The vertical levitation force and stiffness has been measured over the whole sample area using a permanent magnet and force sensors moved by a 3-dimensional positioning system. The measurements were performed in the field-cooled and zero-field-cooled state. In addition the magnetic field distribution of the flux frozen in by the superconductor was mapped with a Hall probe.<>
Keywords :
X-ray chemical analysis; barium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetic levitation; optical microscopy; scanning electron microscopy; superconducting transition temperature; yttrium compounds; 3-dimensional positioning system; Hall probe; SEM; YBa/sub 2/Cu/sub 3/O/sub 7-x/; YBa/sub 2/Cu/sub 3/O/sub 7/; critical current density; energy dispersive X-ray diffraction; field-cooled state; force sensors; frozen flux; magnetic field distribution; melt-textured; modified LPP-process; optical microscopy; permanent magnet sensors; stiffness; transition temperature; vertical levitation force; zero-field-cooled state; Electron microscopy; Force measurement; Force sensors; Magnetic field measurement; Magnetic forces; Magnetic materials; Optical microscopy; Scanning electron microscopy; Superconducting transition temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
