Abstract
The time-dependent magnetic relaxation was measured in a full-field-penetrated YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] detwinned crystal for long times up to 5[times]10[sup 5] sec. The relaxation data exhibit a power-law time dependence of magnetization over a wide range of temperature and magnetic field with the field oriented both parallel and perpendicular to the [ital c] axis of the crystal. The results are consistent with a flux-creep model assuming logarithmic current dependence of the flux-creep activation energy.
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