JOSEPHSON-JUNCTION CHARACTER ALONG THE C-AXIS IN BI2SR2CACU2O8+DELTA
JOSEPHSON-JUNCTION CHARACTER ALONG THE C-AXIS IN BI2SR2CACU2O8+DELTA
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DOI：
10.1016/0921-4526(94)91619-5
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发表时间：
1994-02-01
期刊：
影响因子：
2.8
通讯作者：
MOCHIKU, T
中科院分区：
文献类型：
--
作者：
KADOWAKI, K;MOCHIKU, T
研究了单晶Bi2Sr2CaCu2O8+在磁场中沿c轴方向的临界电流。观察到电流-电压关系具有突跃和特征滞后，这使人联想到典型的约瑟夫森结特征。在0K下获得的最大临界电流密度约为230A/cm2，似乎符合约瑟夫森电流随温度变化的特征。此外，结电阻随磁场与c轴夹角的变化呈现一个宽度小于0.5度的特殊尖峰，它强烈地依赖于电流密度和磁场。这种非常接近ab平面的新现象暂时归因于约瑟夫森涡旋运动的影响。
Critical currents along the c-axis have been studied in single crystalline Bi2Sr2CaCu2O8+delta in magnetic fields. It is observed that the current-voltage relation has a sudden jump with a characteristic hysteresis, reminiscent of the typical Josephson junction character. The maximum critical current density obtained is approximately 230 A/cm2 at 0 K and it seems to follow the characteristic temperature dependence of the Josephson current. In addition, the angular dependence of the junction resistance as a function of angle between magnetic field and c-axis shows a peculiar sharp peak with a width less than 0.5-degrees, which strongly depends upon the current density and the magnetic field. This new phenomenon very close to the ab-plane is temporarily attributed to the effect of motion of the Josephson vortex.