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arXiv 0809.1743cond-mat.supr-con
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随机去除钉扎点抑制三角形反点阵列Nb薄膜中的耗散

Suppression of dissipation in Nb thin films with triangular antidot arrays by random removal of pinning sites

M. Kemmler, D. Bothner, K. Ilin, M. Siegel, R. Kleiner, D. Koelle

摘要:

本文研究了在相变温度Tc附近,具有随机稀释三角形反点阵列的Nb薄膜的脱钉电流Ic随外加磁场B的变化。我们的实验证实了如Reichhardt和Olson Reichhardt [Phys.Rev. B 76,094512(2007)]所预测的Ic(B)中的基本特征。%我们表明,通过在周期性钉扎阵列中引入无序,可以增强IC。特别地,对于具有固定的反点密度n_p的阵列,当B>Bp=n_p Phi_0时,稀释度Pd的增加引起Ic的增加和磁通流电压的降低。

英文摘要:

The depinning current Ic versus applied magnetic field B close to the transition temperature Tc of Nb thin films with randomly diluted triangular arrays of antidots is investigated. % Our experiments confirm essential features in Ic(B) as predicted by Reichhardt and Olson Reichhardt [Phys.Rev. B 76, 094512 (2007)]. % We show that, by introducing disorder into periodic pinning arrays, Ic can be enhanced. % In particular, for arrays with fixed density n_p of antidots, an increase in dilution Pd induces an increase in Ic and decrease of the flux-flow voltage for B>Bp=n_p Phi_0.

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