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Suppression of spontaneous currents in Sr_2RuO_4 by surface disorder

机译:表面紊乱对Sr_2RuO_4自发电流的抑制

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摘要

A major challenge to the chiral p-wave hypothesis for the pairing symmetry of the unconventional superconductor Sr_2RuO_4 is the null result of sensitive scanning magnetometry experiments designed to detect the expected spontaneous charge currents. Motivated by junction tunneling conductance measurements, which indicate the quenching of superconductivity at the surfaces of even high-purity samples, we examine the spontaneous currents in a chiral p-wave superconductor near a normal metal/superconductor interface using the lattice Bogoliubov-de Gennes equations and Ginzburg-Landau theory, and find that the edge current is suppressed by more than an order of magnitude compared to previous estimates. These calculations demonstrate that interface details can have a quantitatively meaningful effect on the expectations for magnetometry experiments.
机译:非常规超导体Sr_2RuO_4的配对对称性的手性p波假设的主要挑战是旨在检测预期的自发充电电流的灵敏扫描磁强法实验的无效结果。受结隧穿电导率测量(表明甚至在高纯度样品表面超导性的淬灭)的推动,我们使用晶格Bogoliubov-de Gennes方程检查了正常金属/超导体界面附近的手性p波超导体中的自发电流和Ginzburg-Landau理论,发现边缘电流与以前的估计相比被抑制了一个数量级以上。这些计算表明,界面细节可以对磁力计实验的期望值产生数量上有意义的影响。

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  • 来源
    《Physical review》 |2014年第13期|134521.1-134521.6|共6页
  • 作者单位

    Department of Physics, Stanford University, Stanford, California, 94305, USA;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada;

    Department of Physics, Stanford University, Stanford, California, 94305, USA,SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada,Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ruthenates;

    机译:钌酸;

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