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首页> 外文期刊>Physical review >Transport anisotropy as a probe of the interstitial vortex state in superconductors with artificial pinning arrays
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Transport anisotropy as a probe of the interstitial vortex state in superconductors with artificial pinning arrays

机译：传输各向异性作为具有人工钉扎阵列的超导体中间隙涡态的探针

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摘要

We show using simulations that when interstitial vortices are present in superconductors with periodic pinning arrays, the transport in two perpendicular directions can be anisotropic. The degree of the anisotropy varies as a function of field due to the fact that the interstitial vortex lattice has distinct orderings at different matching fields. The anisotropy is most pronounced at the matching fields but persists at incommensurate fields, and it is most prominent for triangular, honeycomb, and kagome pinning arrays. Square pinning arrays can also show anisotropic transport at certain fields in spite of the fact that the perpendicular directions of the square pinning array are identical. We show that the anisotropy results from distinct vortex dynamical states and that although the critical depinning force may be lower in one direction, the vortex velocity above depinning may also be lower in the same direction for ranges of external drives where both directions are depinned. For honeycomb and kagome pinning arrays, the anisotropy can show multiple reversals as a function of field. We argue that when the pinning sites can be multiply occupied such that no interstitial vortices are present, the anisotropy is strongly reduced or absent.
机译：我们使用模拟显示，当具有周期性钉扎阵列的超导体中存在间隙涡时，在两个垂直方向上的传输可能是各向异性的。由于间隙涡旋晶格在不同的匹配场上具有不同的次序这一事实，各向异性的程度随场的变化而变化。各向异性在匹配场上最明显，但在不相称的场上仍然存在，并且在三角形，蜂窝和kagome固定阵列中最明显。尽管方形钉扎阵列的垂直方向相同，但方形钉扎阵列也可以在某些场显示各向异性传输。我们表明，各向异性是由不同的涡旋动力学状态引起的，并且尽管临界脱钉力在一个方向上可能较低，但对于在两个方向都脱销的外部驱动器范围，在相同方向上脱钉以上的涡旋速度也可能较低。对于蜂窝和kagome固定阵列，各向异性可以显示出多次反转，这是场的函数。我们认为，当钉扎位点可以被多重占据以致不存在间隙涡流时，各向异性将大大降低或消失。

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