Vortex states in a submicron Bi2212 crystal probed by intrinsic Josephson junctions
Vortex states in a submicron Bi2212 crystal probed by intrinsic Josephson junctions
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通过本征约瑟夫森结探测亚微米 Bi2212 晶体中的涡旋态
DOI：
10.1088/1742-6596/969/1/012034
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Arisawa
中科院分区：
文献类型：
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作者：
S. Ooi;M. Tachiki;T. Mochiku;H.B. Wang;K. Komori;K. Hirata;S. Arisawa
为了研究亚微米Bi2 Sr2 CaCu2 O8+y(Bi2 2 12)晶体中的薄片涡旋态，我们测量了横向尺寸小于1µm的本征约瑟夫森结的c轴电阻和I-V特性，虽然被7.5kΩ的并联电阻意外地分流了，但减去分量后的I-V特性显示出均匀的多个分支。在阻力测量中，可以清楚地观察到单涡对亚微米堆栈的穿透。通过在H-T平面上绘制c轴阻力图，建立了涡旋相图。第一涡穿透场的温度依赖性与超导带中心形成薄饼涡堆的理论估计是一致的。
To study the pancake-vortex states confined in a submicron Bi 2 Sr 2 CaCu 2 O 8+ y (Bi2212) crystal, we have measured the c-axis resistance and I-V characteristics of a stack of intrinsic Josephson junctions with a lateral dimension less than 1 µm. Although the stack was accidentally shunted by a parallel resistance of 7.5 kΩ, the I-V characteristics show homogeneous multiple branches after the subtraction of the component. The penetrations of single vortices into the submicron stack were clearly observed in the resistance measurements. A vortex phase diagram was constructed by mapping the c-axis resistance on an H-T plane. Temperature dependence of the first-vortex penetration field is consistent with the theoretical estimation on the formation of a pancake-vortex stack in the center of a superconducting strip.