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arXiv 1708.03082cond-mat.supr-con
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多晶涡旋晶格中畴壁运动的观察

Observation of domain wall motion in a polycrystalline vortex lattice

Malcolm Durkin, Ian Mondragon-Shem, Taylor L. Hughes, Nadya Mason

摘要:

我们目前的测量显示如何无序决定的动态涡旋晶格。使用放置在有限磁场中的超导体-正常超导体(SNS)阵列,通过将场从其中涡旋晶格与SNS阵列相称的值移开来引入无序。通过施加电流来驱动涡旋运动,我们观察到在无公度场的两步转变:首先从钉扎涡旋到晶格缺陷运动,然后从单个缺陷到体涡旋晶格流。这种行为与多晶涡旋结构一致,其中缺陷形成在晶域的边缘上。这表明,一个无序的,相互作用的旋涡系统可以有利于界面物理,而不是准周期性制度。

英文摘要:

We present measurements showing how disorder determines the dynamics of a vortex lattice. Using superconductor-normal-superconductor (SNS) arrays placed in finite magnetic fields, disorder is introduced by shifting the field away from values where the vortex lattice is commensurate with the SNS array. By applying a current to drive vortex motion, we observe a two-step transition at incommensurate fields: first from pinned vortices to lattice defect motion, and then from individual defect to bulk vortex lattice flow. This behavior is consistent with a polycrystalline vortex structure where defects form on the edges of crystalline domains. This demonstrates that a disordered, interacting vortex system can favor interface physics rather than a quasiperiodic regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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