Model calculation of orientational effect of deformed aerogel on the order parameter of superfluid 3He

TL;DR

This paper applies a theoretical model to quantify how deformed aerogel influences the orientation of the superfluid 3He order parameter, determining the minimal deformation needed for stability under different scattering conditions.

Contribution

It extends existing theory to calculate the orientational effects of deformed aerogel on superfluid 3He, including stability criteria for ordered states.

Findings

Minimum deformation stabilizes the ordered state.

Differences between specular and diffusive scattering effects.

Quantitative estimates of deformation thresholds.

Abstract

Theory of Rainer and Vuorio of small objects in superfluid ^3He is applied for calculation of the average orientational effect of a deformed aerogel on the order parameter of 3He. The minimum deformation which stabilizes the ordered state is evaluated both for specular and diffusive scattering of quasiparticles by the threads of aerogel.