Critical current density and activation energy in melt textured growth YBaCuO from magnetic measurements

✍ Scribed by D. Delagnes; N. Pellerin; A.R. Fert; P. Odier; A. Mari; X. Bozec; J.P. Redoules

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 714 KB
• Volume: 211
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90142-d

✦ Synopsis

Textured YBaCuO samples have been prepared using a modified melt textured growth (MTG) method. AC susceptibility data are presented showing the high quality of the textured samples. Static hysteresis loop measurements are realized for magnetic fields up to 5 T in a large temperature range (4.2 to 100 K). The anisotropic behavior is studied, the magnetic field being applied successively in the (ab) planes and along the c-axis. The critical current densities are obtained using the Bean model. Dynamic hysteresis loop measurements are performed at T> 77 K and over the frequency range from 0.2 to 10 Hz using a field of 800 Oe. The magnetization relaxation effect appears to be significantly lower in the textured sample than in a single crystal. The characteristic activation energies calculated in the flux creep model are presented.