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A review of giant correlation-length effects via proximity and weak-links coupling in a critical system: 4 He near the superfluid transition
Reports on Progress in Physics ( IF 16.620 ) Pub Date : 2019-10-01 , DOI: 10.1088/1361-6633/ab3df5
J K Perron, M O Kimball and F M Gasparini

We review measurements of 4 He near the superfluid transition in arrangements whereby an array of weak links couple relatively larger, more bulk-like 4 He 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 ##IMG## [http://ej.iop.org/images/0034-4885/82/11/114501/ropab3df5ieqn001.gif] , where ##IMG## [http://ej.iop.org/images/0034-4885/82/11/114501/ropab3df5ieqn002.gif] , is involved in these long-range effects, the distance over w...
更新日期:2019-10-02

 

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