Magnetic relaxation and collective creep in a grain aligned sample of YBa2Cu3O7-δ
Résumé
Measurements of creep of magnetic flux lines are conducted in a c axis grain-aligned sample of YBa2Cu3O7-δ within the temperature region from 4.2 to 90K. for fields ranging from 0 to 6T. The effective pinning energy U0 and the power μ are obtained.