Complex susceptibility of superconducting BiPbSrCaCuO ceramics fabricated through combined magnetic melt texturing and hot pressing

Abstract

Complex a.c. susceptibility measurements in a broad field range (1 Oe < h ac < 100 Oe) have been made on Bi-Pb-Sr-Ca-Cu-O (Bi-2223 phase) bulk samples obtained by combined magnetic melt texturing and hot pressing. Highly anisotropic properties are observed. Improved intergranular coupling is obtained in the direction perpendicular to the applied stress and the magnetic field direction. An intragranular peak is also observed for the same direction. This is the first time that an intragranular loss peak has been clearly seen in a bismuth-based compound, which indicates that the intragranular contribution is strongly increased.

Characterization of high-temperature superconductors by AC susceptibility measurements

“…Therefore the knowledge of λ L as well as the grain shape and dimension is important (Yang et al 1994a). In particular for Bi-2223 superconductors with plate-like grains, the susceptibility depends strongly on the field orientation (Berling et al 1996a) and this difference can be used to estimate the degree of texturing (Gömöry et al 1996). For the grains supposed to have the form of slab-like columns instead of cylinders the formula (4.5.10) should be modified using tanh(R g /λ L ) in place of the Bessel functions (Angurel et al 1994).…”

The influence of texturing through zone melting or hot pressing under magnetic fields on the magnetic susceptibility of high temperature superconducting ceramics

“…Electrical resistivity and magnetic hysteresis measurements show that the samples are anisotropic: high The ac complex susceptibility measurements [3] were achieved by using ac fields h ac in an extended range (1Oe <h ac < 500Oe) and show highly anisotropic properties both for χ (diamagnetic shielding) and χ (energy losses).…”