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Temperature dependent pinning phenomenon in superconducting Nb films with triangular and honeycomb pinning arrays

机译:具有三角形和蜂窝钉扎阵列的超导Nb薄膜的温度依赖钉扎现象

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The pinning phenomena in superconducting Nb films with triangular and honeycomb pinning arrays were explored. Special temperature dependent phenomena were found for both films. For the film with a triangular pinning array, the pronounced matching peaks in the critical currents as a function of magnetic field reduce from six to three within a narrow temperature range. This temperature dependent matching effect is explained by considering the dramatic change of coherent length with temperature when the temperature is close to T-c. In order to compare with the film with a triangular pinning array, we fabricated a film with a honeycomb pinning array with similar pinning site spacing and pinning size. Special prominent matching peaks at H = 3.5H(1) were found for this film. Molecular dynamic simulations were made to study this phenomenon. The ground state distribution of vortices obtained from simulations reasonably explains the prominent matching peaks. Pronounced temperature dependent matching effects were also found for the film with a honeycomb pinning array.
机译:探索了三角形和蜂窝钉扎阵列的超导铌薄膜的钉扎现象。两种膜都发现了特殊的温度依赖性现象。对于具有三角形钉扎阵列的薄膜,临界电流中明显的匹配峰随磁场的变化在狭窄的温度范围内从六个减少到三个。通过考虑温度接近T-c时相干长度随温度的急剧变化来解释这种与温度有关的匹配效果。为了与具有三角形钉扎阵列的薄膜进行比较,我们制作了带有蜂窝钉扎阵列的薄膜,其钉扎点间距和钉扎尺寸相似。该膜发现在H = 3.5H(1)处有特别突出的匹配峰。进行分子动力学模拟以研究该现象。通过模拟获得的旋涡的基态分布合理地解释了突出的匹配峰。还发现具有蜂窝钉扎阵列的薄膜具有明显的温度依赖性匹配效果。

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