Title :
Torque measurements of textured Y1Ba2Cu3 O7-x sintered pellets
Author :
Celani, F. ; Fruchter, L. ; Giovannella, C. ; Messi, R. ; Pace, S. ; Saggese, A. ; Sparvieri, N.
Author_Institution :
INFN-Lab. Nat. di Frascati, Italy
fDate :
3/1/1989 12:00:00 AM
Abstract :
The authors present at 4.2 K magnetic torque balance study of a textured sintered YBCO sample produced by pyrolysis using in the thermal treatments an ozone-enriched oxygen atmosphere. The shape of the torque signal as a function of the angle and of the measuring field shows features that are intermediate between those of a standard sintered pellet and those of a single crystal. The anisotropic experimental values of the lower critical field Hc1 compare rather well to those previously found on YBCO single crystals. The intensity of the remaining magnetization, measured after a field cycling procedure, suggests the existence of a strong pinning for H⩾Hc1(c) along the c-axis
Keywords :
barium compounds; flux pinning; high-temperature superconductors; magnetisation; superconducting critical field; yttrium compounds; 4.2 K; c-axis; field cycling; high temperature superconductor; lower critical field; magnetic torque balance study; magnetization; pyrolysis; sintered pellets; strong pinning; textured Y1Ba2Cu3O7-x; thermal treatments; Anisotropic magnetoresistance; Atmosphere; Atmospheric measurements; Magnetic anisotropy; Magnetic field measurement; Measurement standards; Perpendicular magnetic anisotropy; Shape measurement; Torque measurement; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
