Title :
Anomalous magnetisation of YBCO and BSCCO single crystals
Author :
Yang, G. ; Abell, J.S. ; Gough, C.E.
Author_Institution :
Birmingham Univ., UK
fDate :
3/1/1993 12:00:00 AM
Abstract :
Anomalous magnetization characteristics of YBa/sub 2/Cu/sub 3/O/sub y/ and Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub y/ single crystals and their oxygen vacancy dependences are reported. In these crystals the magnetization exhibits a maximum as a function of the applied field. Significant differences in the anomalous magnetization of the YBCO and BSCCO crystals indicate different origins. Several possible explanations are compared with experimental results. Two kinds of pinning centers with different T/sub c/´s could explain the anomalous magnetization of YBCO, while 2-D pancake vortices matching a 2-D defect structure may account for the BSCCO results.<>
Keywords :
barium compounds; bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetic hysteresis; magnetisation; strontium compounds; yttrium compounds; 2D defect structure; 2D pancake vortices; BSCCO single crystals; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub y/; O vacancy; YBCO; YBa/sub 2/Cu/sub 3/O/sub y/; anomalous magnetization; critical current density; high temperature superconductors; magnetic hysteresis; pinning centers; Anisotropic magnetoresistance; Bismuth compounds; Crystal microstructure; Current measurement; Magnetic field measurement; Magnetic hysteresis; Magnetization; Superconductivity; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
