Low-field flux creep behavior near second peak H2p in Pr-doped Bi-2212 single crystal
- Hsu, Y.Y.
DOIAbstract
[[abstract]]Magnetic hysteresis M(H) and magnetic relaxation M(t) results on Pr-doped single-crystal Bi2Sr2Ca0.89Pr0.11Cu2O8+δ with optimum Tc=88 K are reported. Superconducting H-T phase diagram with applied field parallel to single-crystal c-axis indicates that in the mixed state the anomalous second peak field and its onset field H2p/Hon varies from 900/800 G at 15 K to 210/85 G at 40 K with a plateau around 20-30 K. Low-field magnetic relaxation M(t) data near H2p/Hon indicates a distinct change of flux creep behavior. For H<Hon, the relaxation mechanism follows the collective creep model M(t)=M0[1+(μkBT/U0)ln(t/t0)]-1μ/ and crosses to the vortex glass model M(t)=M0(t/t0)1[1-(Uo/kBT)]/ when Hon. Such a crossover behavior implies a chang...
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