TRAINS OF FLUX JUMPS OBSERVED IN A QUENCH-AND-MELT-GROWN YBA2CU3O7 UNDER PULSED MAGNETIC-FIELD

Authors
TAKIZAWA T ITOH T TANIMURA Y KANBARA K MORITA M HASHIMOTO M
Citation
T. Takizawa et al., TRAINS OF FLUX JUMPS OBSERVED IN A QUENCH-AND-MELT-GROWN YBA2CU3O7 UNDER PULSED MAGNETIC-FIELD, JPN J A P 2, 33(5A), 1994, pp. 120000631-120000634
Citations number
9
Categorie Soggetti
Physics, Applied
Journal title
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS → ACNP
Volume
33
Issue
5A
Year of publication
1994
Pages
120000631 - 120000634
Database
ISI
SICI code
Abstract
The motion of quantized fluxes in ring-shaped YBa2Cu3O7 samples has be en observed under pulsed magnetic field in the 15 K to critical temper ature (T(c) range. Successive flux jumps have been observed in a low-J (c) sample, where J(c) is the transport critical current density. All these jumps are determined by the Lorentz force, and not by the therma l avalanche conditions. It is suggested that the trains of jumps are c aused by the weakened pinning force in a degraded sample.