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首页> 外文期刊>Physical review >Surface Vortex Depinning In An Irradiated Single Crystal Microbridge Of Bi_2sr_2cacu_2o_(8+δ): Crossover From Individual To Collective Bulk Pinning
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Surface Vortex Depinning In An Irradiated Single Crystal Microbridge Of Bi_2sr_2cacu_2o_(8+δ): Crossover From Individual To Collective Bulk Pinning

机译：Bi_2sr_2cacu_2o_（8 +δ）辐照单晶微桥中的表面涡旋脱钉：从个人到集体批量钉扎的交叉

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Current-voltage characteristics have been performed on an irradiated microbridged Bi_2Sr_2CaCu_2O_(8+δ) single crystal at low temperature (T=5 K) in a magnetic field applied parallel to the c axis. The evolution of the I-V characteristics that leads to a peak in the differential resistance r_d(I) = dV/dR(I) in the vicinity of the "peak effect" in the critical current was investigated. The analysis of the current-dependent differential resistance curves shows that the dynamics of the vortices in the vicinity of B_φ is dominated by the plastic flow of interstitially pinned vortex around regions of flux lines strongly pinned at the columnar defects. The pinning is found to be individual at low magnetic fields and collective when the vortex-vortex interactions are involved.
机译：在平行于c轴的磁场中，在低温（T = 5 K）下，对辐照的微桥Bi_2Sr_2CaCu_2O_（8 +δ）单晶进行了电流-电压特性测试。研究了在临界电流中“峰值效应”附近导致差动电阻r_d（I）= dV / dR（I）达到峰值的I-V特性的演变。对电流相关的差动电阻曲线的分析表明，B_φ附近的涡旋动力学主要受围绕钉扎在圆柱状缺陷处的磁通线区域周围的间隙钉扎涡旋的塑性流动的影响。发现在低磁场中钉扎是单个的，并且在涉及涡旋-涡旋相互作用时是钉扎的。

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