SUPERFLUID TRANSITION OF HE-4 IN FRACTAL MEDIA

被引：7

作者：

DOSSANTOS, RR

BRANCO, NS

DEQUEIROZ, SLA

机构：

[1] Departamento de Fisica, Pontificia Universidade Catdlica do Rio de Janeiro C.P. 38071, Rio de Janeiro

[2] Departamento de Fisica, Universidade Federal de Santa Caterina, Florianpolis SC

[3] Department of Theoretical Physics, Oxford, OX1 3NP

来源：

EUROPHYSICS LETTERS | 1990年 / 13卷 / 07期

关键词：

D O I：

10.1209/0295-5075/13/7/013

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The superfluid transition of 4He in some porous media is studied through a fractal model. We incorporate the fractal aspects of the medium in both the Harris criterion and the hyperscaling relations, so that the experimentally observed nonbulk exponents can be consistently explained as resulting from a crossover to new behaviour. Available data for aerogel suggest that the superfluid transition in this case is a fractal su$ace (as opposed to volume) phenomenon, which can be modelled microscopically by means of an inhomogeneous effective mass. The implications of this model for the transition in xerogels and in Vycor are discussed. © 1990 IOP Publishing Ltd.

引用

页码：647 / 652

页数：6

共 36 条

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