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arXiv 2408.14985cond-mat.supr-concond-mat.softcond-mat.str-el
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二维涡旋液体中的脆性到强玻璃转变

Fragile-to-strong glass transition in two-dimensional vortex liquids

Ilaria Maccari, Lara Benfatto, Claudio Castellani, José Lorenzana, Cristiano De Michele

AI总结:

本文通过实验与蒙特卡洛模拟证明,二维超导涡旋液体的脆性可由外磁场或无序强度调控,并揭示脆性到强玻璃转变源于六角序笼效应与随机钉扎的相互作用。

摘要:

脆性到强玻璃转变是一个引人入胜的现象,至今仍存在许多理论和实验上的挑战,其中一个主要问题是如何调控玻璃形成液体的脆性。本文研究了一个由超导薄膜中的涡旋组成的二维系统,该系统在有效行为上表现为二维玻璃形成液体。我们表明,该系统中的动力学脆性可以通过调节单一参数在实验上加以改变:即横向施加于薄膜的外部磁场 $H$。这一结论得到了非晶 MoGe 超导薄膜实验测量分析与无序 XY 模型蒙特卡洛模拟之间直接比较的支持,该模型捕捉了两步熔化转变的普适类。我们表明,通过增加无序强度,可以诱导脆性到强转变,这与磁场中的实验结果非常相似。我们的数值结果揭示了从脆性玻璃到强玻璃的动力学非均匀性演化,其源于六角序引起的笼效应与强随机钉扎之间的微妙相互作用。

英文摘要:

The fragile-to-strong glass transition is a fascinating phenomenon that still presents many theoretical and experimental challenges. A major one is how to tune the fragility of a glass-forming liquid. Here, we study a two-dimensional (2D) system composed of vortices in a superconducting film, which effectively behaves as a 2D glass-forming liquid. We show that the kinetic fragility in this system can be experimentally varied by tuning a single parameter: the external magnetic field $H$ applied transversely to the film. This conclusion is supported by the direct comparison between the analysis of experimental measurements in an amorphous MoGe superconducting film and Monte Carlo simulations in a disordered XY model, that captures the universality class of the two-step melting transition. We show that by increasing disorder strength a fragile-to-strong transition is induced, in close similarity with the experimental findings in a magnetic field. Our numerical results shed light on the evolution of the dynamical heterogeneity from a fragile to strong glass, as due to the subtle interplay between caging effects arising from hexatic order and strong random pinning.

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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