Transport anisotropy as a probe of the interstitial vortex state in superconductors with artificial pinning arrays

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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 ... continued below

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Reichhardt, Charles & Reichhardt, Cynthia January 1, 2008.

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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.

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  • Journal Name: Physical Review B; Journal Volume: 79

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  • Report No.: LA-UR-08-07580
  • Report No.: LA-UR-08-7580
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956613
  • Archival Resource Key: ark:/67531/metadc925724

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  • January 1, 2008

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 5:11 p.m.

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Reichhardt, Charles & Reichhardt, Cynthia. Transport anisotropy as a probe of the interstitial vortex state in superconductors with artificial pinning arrays, article, January 1, 2008; [New Mexico]. (digital.library.unt.edu/ark:/67531/metadc925724/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.