Long-range order in the A-like phase of superfluid 3He in aerogel

TL;DR

This paper investigates how anisotropy influences the long-range order in superfluid 3He within aerogel, revealing that a robust component of the order parameter can sustain order even with minimal anisotropy.

Contribution

It introduces the concept that a robust component of the order parameter can maintain long-range order in superfluid 3He despite weak global anisotropy.

Findings

Strong global anisotropy stabilizes ABM order parameter.

In the limit of vanishing anisotropy, fluctuations become critical.

A robust component of the order parameter persists with small fluctuations.

Abstract

A mutual action of the random anisotropy brought in the superfluid 3He by aerogel and of the global anisotropy caused by its deformation is considered. Strong global anisotropy tends to suppress fluctuations of orientation of the order parameter and stabilizes ABM order parameter. In a limit of vanishing anisotropy these fluctuations are getting critical. It is argued that still in a region of small fluctuations the average order parameter can acquire "robust" component. This component maintains a long-range order even in a limit of vanishing global anisotropy.