Flux Creep Characteristics after High-Temperature Magnetization in YBaCuO Superconductor

Abstract

Flux creep characteristics at an operating temperature T o have been investigated experimentally after temperature changes from the critical state, which were created by cooling a YBaCuO superconductor magnetized at higher temperatures T o +Δ T (HTM). Drastic reduction in the creep rate by one order of magnitude was observed for Δ T \gtrsim3 K at T o ranging from 40 to 77 K. A transient state with high HTM creep rate has also been observed at high operating temperature and is ascribed to flux profile variations induced by strengthened diamagnetic properties at low temperatures.