无序超导薄膜磁电阻的微观理论
Microscopic theory of the magnetoresistance of disordered superconducting films
摘要：
对无序超导薄膜的实验表明，在无序超导薄膜中存在几个数量级的磁电阻峰。从无序负U哈伯德模型出发，我们采用包含热涨落的从头计算方法来计算电阻，并完全再现了实验现象。微观电流和局部电势的地图使我们能够精确定位磁阻峰值的来源--导电的薄弱环节从峰值的低场一侧的正常变化到高场一侧的超导。最后，我们制定了一个简单的一维模型，以证明如何小超导区域将作为薄弱环节，在这样一个无序的薄膜。
英文摘要：
Experiments on disordered superconducting thin films have revealed a magnetoresistance peak of several orders of magnitude. Starting from the disordered negative-U Hubbard model, we employ an ab initio approach that includes thermal fluctuations to calculate the resistance, and fully reproduces the experimental phenomenology. Maps of the microscopic current flow and local potential allow us to pinpoint the source of the magnetoresistance peak -- the conducting weak links change from normal on the low-field side of the peak to superconducting on the high-field side. Finally, we formulate a simple one-dimensional model to demonstrate how small superconducting regions will act as weak links in such a disordered thin film.
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