Transport properties of the multiple vortices in superconductors with square pinning arrays

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• 作者：Hakan Yetis (1)
  
  1. Department of Physics ; Abant Izzet Baysal University ; 14280 ; Bolu ; Turkey
  
• 关键词：Solid State and Materials
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：88
• 期：4
• 全文大小：837 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Physics
  Complexity
  Fluids
  Solid State Physics and Spectroscopy
  Superconductivity, Superfluidity and Quantum Fluids
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6036

文摘

This work mainly examines the anisotropic transport phenomenon in the presence of square arrays of the mesoscopic pinning sites in superconducting samples. Our results were obtained from a series of numerical simulations as functions of the magnetic field and the pinning radius. Dynamic behaviors of the multi and interstitial vortex states were studied by means of the current-voltage V(I) curves which illustrate anisotropic behavior as a function of the driving force applied in two perpendicular directions. At the matching magnetic fields, it was found that V(I) curves are mainly isotropic for a large pinning radius, but also anisotropic when at least two or more vortices are present at the interstitial regions. The results indicated that the anisotropic effects took place at low driving forces and the critical depinning force in the x-direction is mostly lower than that obtained in the y-direction. In the presence of multiply occupied pinning sites and interstitial vortices, the initial stable configuration and orientational orderings of the entire vortices determined the degree of transport anisotropy.