A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: 4He near the superfluid transition

IF 19 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Reports on Progress in Physics Pub Date : 2019-08-22 DOI:10.1088/1361-6633/ab3df5
J. Perron, M. Kimball, F. Gasparini
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引用次数: 4

Abstract

We review measurements of 4He near the superfluid transition in arrangements whereby an array of weak links couple relatively larger, more bulk-like 4He regions. In contrast to experiments which focus on the dependence of the superflow on the chemical potential difference across the links, these studies focus on the specific heat of both the weak links and that of the larger coupled regions, as well as the behavior of the superfluid fraction within the weak links. The data show unexpected results which reflect a very long range coupling as well as modification of the weak link itself due to the proximity to bulk-like helium. One finds that while the three-dimensional correlation length , where , is involved in these long-range effects, the distance over which these can be seen is of the order of 100 to 1000 times . These results call into question our understanding of the meaning of the correlation length at a critical point as the ‘range’ over which information can propagate. These studies are the first to measure the thermodynamic properties of weak links for a critical system where fluctuations are important. They differ in essential ways with expectations from mean-field considerations. We compare results with other 4He measurements, with superconductors and the theoretical calculations of the Ising model.
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临界系统中通过邻近和弱链耦合的巨相关长度效应综述:超流体跃迁附近
我们回顾了超流体跃迁附近4He的测量结果,其中一系列弱链接偶联相对较大,更像块体的4He区域。与关注超流依赖于链接间化学势差的实验不同,这些研究关注于弱链接和大耦合区域的比热,以及弱链接内超流分数的行为。数据显示了意想不到的结果,这反映了一个很长的距离耦合,以及由于接近块状氦而对弱链本身的修改。人们发现,虽然三维相关长度涉及到这些远距离效应,但这些效应可以被看到的距离是100到1000倍。这些结果让我们对临界点处的相关长度的理解产生了疑问,即信息可以传播的“范围”。这些研究首次测量了波动很重要的临界系统弱环节的热力学性质。它们在本质上与平均场考虑的期望不同。我们将结果与其他4He测量、超导体和伊辛模型的理论计算进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Reports on Progress in Physics
Reports on Progress in Physics 物理-物理:综合
CiteScore
31.90
自引率
0.00%
发文量
45
审稿时长
6-12 weeks
期刊介绍: Reports on Progress in Physics is a highly selective journal with a mission to publish ground-breaking new research and authoritative invited reviews of the highest quality and significance across all areas of physics and related areas. Articles must be essential reading for specialists, and likely to be of broader multidisciplinary interest with the expectation for long-term scientific impact and influence on the current state and/or future direction of a field.
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