CORRELATED RANDOM-CHEMICAL-POTENTIAL MODEL FOR THE PHASE-TRANSITIONS OF HELIUM MIXTURES IN POROUS-MEDIA

被引：55

作者：

FALICOV, A

BERKER, AN

机构：

[1] Department of Physics, Massachusetts Institute of Technology, Cambridge

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.74.426

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A lattice model is constructed for He3-He4 mixtures in porous media, characterized by correlated random chemical-potential differences between isotopes. Sites with high chemical-potential differences form a random connected porous structure, similar to silica strands in aerogel. We find by Monte Carlo simulation that the bulk tricritical phase diagram is replaced: The λ line extends to zero temperature, as had been theoretically predicted some time ago, and phase separation occurs within the superfluid phase. These findings and the behavior of the order parameter agree with recent experiments. © 1995 The American Physical Society.

引用

页码：426 / 429

页数：4

共 19 条

[1] PHASE-BEHAVIOR OF THE LIQUID-CRYSTAL 8CB IN A SILICA AEROGEL [J].