Local superfluid densities probed via current-induced superconducting phase gradients
Local superfluid densities probed via current-induced superconducting phase gradients
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通过电流感应超导相位梯度探测局部超流体密度
DOI：
10.1103/physrevb.76.220506
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发表时间：
2007
影响因子：
3.7
通讯作者：
A. Bezryadin
中科院分区：
文献类型：
--
作者：
David S. Hopkins;D. Pekker;T. Wei;P. Goldbart;A. Bezryadin
我们开发了一种超导相位梯度计，由两条平行的dna模板纳米线连接两根薄膜引线组成。我们已经将垂直于纳米线的交叉电流倾斜，并观察到由于交叉电流引起的相位差导致引线对引线电阻的振荡。利用该梯度仪，我们测量了超流体密度对温度和磁场的依赖关系，并观察到弹性涡旋位移引起的相位梯度放大。我们根据米勒-巴丁肮脏超导体理论和坎贝尔场穿透模型的微观版本来检查我们的数据。
We have developed a superconducting phase gradiometer consisting of two parallel DNA-templated nanowires connecting two thin-film leads. We have ramped the cross current flowing perpendicular to the nanowires, and observed oscillations in the lead-to-lead resistance due to cross-current-induced phase differences. By using this gradiometer we have measured the temperature- and magnetic-field dependence of the superfluid density, and observed an amplification of phase gradients caused by elastic vortex displacements. We examine our data in light of Miller-Bardeen theory of dirty superconductors and a microscale version of Campbell's model of field penetration.