Implication of vortex dimensional crossover on the second magnetization peak in Bi2Sr2CaCu2O8 single crystals Implication of vortex dimensional crossover on the second magnetization peak in Bi2Sr2CaCu2O8 single crystals
Journal of the Korean Physical Society
v.43
no.I
2003년, pp.391 - 395
Dong Ho Kim
(Yeungnam Univ.)
,
Chang Woo Lee
(Yeungnam Univ.)
,
Tae Won Lee
(Yeungnam Univ.)
We applied weak static and dynamic perturbations to the vortex state in Bi2Sr2CaCu2O8 singlecrystals to investigate the underlying mechanism of the second magnetization peak. Low-densitycolumnar defects were introduced into the sample as a static perturbation and small additionaltransverse ac elds were applied as a dynamic perturbation during the magnetization measurement.A reduction of the irreversible magnetization at the second peak was observed after introducing lowdensitycolumnar defects, which is unusual regarding the commonly observed magnetic enhancementdue to columnar defects. Applying ac transverse eld also reduced the magnetization due to easierux entry and exit by dithering the vortices, but the amount of reduction was much higher abovethe second peak with the appearance of ux jump. We nd that both results are well explained bya vortex dimensional crossover near the second magnetization peak.
We applied weak static and dynamic perturbations to the vortex state in Bi2Sr2CaCu2O8 singlecrystals to investigate the underlying mechanism of the second magnetization peak. Low-densitycolumnar defects were introduced into the sample as a static perturbation and small additionaltransverse ac elds were applied as a dynamic perturbation during the magnetization measurement.A reduction of the irreversible magnetization at the second peak was observed after introducing lowdensitycolumnar defects, which is unusual regarding the commonly observed magnetic enhancementdue to columnar defects. Applying ac transverse eld also reduced the magnetization due to easierux entry and exit by dithering the vortices, but the amount of reduction was much higher abovethe second peak with the appearance of ux jump. We nd that both results are well explained bya vortex dimensional crossover near the second magnetization peak.
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