Abstract
A comparative study of the critical current anisotropy in low magnetic fields of Tl-1223 conductors manufactured by different techniques, prepared from different compositions and originating from different research laboratories is presented and discussed. For highly oriented layers, with the magnetic field ( B) parallel to the ab-plane, the normalized critical current density ( j) versus magnetic field characteristic shows very little drop of j value due to the intrinsic properties of the Tl-1223 phase, while all powder-in-tube conductors show a rapid drop of j value in fields as low as 10 mT. For all powder-in-tube conductors, the anisotropy coefficient shows a very pronounced minimum at fields up to 30 mT, followed by a monotonic decrease of anisotropy with increase of the magnetic field. This is due to poor grain alignment and a demagnetizing effect in the powder-in-tube Tl-1223 tapes.
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