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在状物质中的动态不稳定性和记忆效应
1Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot, Israel. hpalt@wis.weizmann.ac.il
Nature
|February 10, 2000
概括
一个新的模型解释了II型超导体中令人费解的旋运动. 它揭示了在样本边缘的无序旋阶段如何被电流化,产生记忆效应,影响不同电流类型下的旋动态.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 超导电性 超导电性 超导电性
- 材料科学 材料科学 材料科学
背景情况:
- 二型超导体表现出复杂的运动,具有历史依赖和不同AC/DC反应等现象,挑战了当前的模型.
- 超导体中的磁流线格子是一个可调的系统,用于研究凝聚物质流动力学.
研究的目的:
- 阐明在II型超导体中观察到的令人费解的旋动态背后的潜在机制.
- 开发一种通用模型,解释历史依赖的反应和在交流和直流电流下差异性移动性.
主要方法:
- 在二化物 (NbSe2) 的单晶中研究了电流分布.
- 开发了一种基于边缘无序旋转相注入和电流驱动动态化之间的竞争模型.
- 在不同电流条件下 (交流对直流偏差) 分析了无序系统的空间依赖.
主要成果:
- 一种新的机制,涉及无序的旋转相注入和动态化之间的竞争,解释了观察到的现象.
- 无序阶段在交流下仅限于样本边缘,允许旋运动,但在直流下主导样本,增强固定并防止运动.
- 该模型成功地解释了低频噪声,电压振荡,历史依赖性和DC偏差抑制的交流响应.
结论:
- 边缘效应和无序旋相的电流诱导化之间的相互作用为复杂的旋动力学提供了统一的解释.
- 无序的系统表现出空间依赖性,作为应用电流历史的活跃记忆.
- 这种机制使以前不兼容的关于的移动性和不同电刺激下的反应的观察结果相协调.
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