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首页> 外文期刊>Physica, B. Condensed Matter >Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors
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Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors

机译：d波超导体表面和界面处的自发电流的拟经典理论

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We investigate the properties of spontaneous currents generated at surfaces and interfaces of d-wave superconductors using the self-consistent quasiclassical Eilenberger equations. The influence of the roughness and reflectivity of the boundaries on the spontaneous current are studied. We show that these have very different effects at the surfaces compared to the interfaces, which reflects the different nature of the time reversal symmetry breaking states in these two systems. We find a signature of the "anomalous proximity effect" at rough d-wave interfaces. We also show that the existence of a subdominant order parameter, which is necessary for time reversal symmetry breaking at the surface, suppresses the spontaneous current generation due to proximity effect at the interface between two superconductors. We associate orbital moments to the spontaneous currents to explain the "supersereening" effect, which seems to be present at all ideal d-wave surfaces and interfaces, where d(xy) is the favorite subdominant symmetry. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 59]
机译：我们使用自洽准经典Eilenberger方程研究d波超导体表面和界面处产生的自发电流的特性。研究了边界的粗糙度和反射率对自发电流的影响。我们表明，与界面相比，它们在表面上具有非常不同的效果，这反映了这两个系统中时间反转对称破坏状态的不同性质。我们在粗糙的d波界面处发现了“异常接近效应”的特征。我们还表明，存在次要阶跃参数，这对于在表面打破时间反向对称性是必需的，它抑制了由于在两个超导体之间的界面处的邻近效应而产生的自发电流。我们将轨道矩与自然流联系起来，以解释“超稀疏”效应，该效应似乎出现在所有理想的d波表面和界面上，其中d（xy）是最喜欢的次对称性。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：59]

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