Examination of Doping Change by C-axis Current Injection in Bi2Sr2CaCu2O8+y and the Influence on Vortex States
Examination of Doping Change by C-axis Current Injection in Bi2Sr2CaCu2O8+y and the Influence on Vortex States
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DOI：
10.1016/j.phpro.2014.09.041
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
S. Ooi;T. Mochiku;M. Tachiki;K. Hirata
中科院分区：
文献类型：
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作者：
S. Ooi;T. Mochiku;M. Tachiki;K. Hirata
最近发现，在Bi2Sr2CaCu2O8+ Y的本然约瑟夫森结（IJJs）堆叠中注入大轴电流可使掺杂水平发生可逆和可控的变化[Y]。科瓦尔等人，苹果公司。理论物理。通讯学报，（2010）：82507。这可能是一种有前途的现场方法来控制超导特性，如超导临界温度的高温超导体。我们通过改变层叠中ijs的数量来重新考察这一掺杂过程，并研究了其对涡态，特别是涡晶格熔化转变的影响。通过电流注入掺杂观察到熔化过渡场的增加，表明各向异性γ (=λc/λab)降低。研究了电流注入掺杂的阈值电压与ijs数目、室温脱掺杂过程中轴向电阻的弛豫以及各向异性变化的关系。
It has recently been found that a largec-axis current injection into a stack of the intrinsic Josephson junctions (IJJs) of Bi2Sr2CaCu2O8+ymakes the doping level change reversibly and controllably [Y. Koval et al., Appl. Phys. Lett.96, (2010) 082507]. This can be one of promisingin-situmethods to control superconducting properties, such as superconducting critical temperatureTcof high-Tcsuperconductors. We re-examined this doping process with changing the number of IJJs in a stack, and studied the influence on the vortex state, especially vortex lattice melting transition. Increase of the melting transition fields was observed by the current injection doping, suggesting the reduction of the anisotropy γ (=λc/λab). Dependence of the threshold voltage for the current injection doping on the number of IJJs, relaxation of thec-axis resistance in room-temperature undoping process, and the change of the anisotropy were evaluated.