Temperature Width and Spin Structure of Superfluid 3He-A1 in Aerogel

TL;DR

This paper investigates how spin-exchange scattering centers affect the temperature range and spin structure of the superfluid 3He-A1 phase in aerogel, revealing that scattering interference significantly alters these properties.

Contribution

It introduces a model considering spin-exchange scattering centers to explain changes in the superfluid 3He-A1 phase in aerogel, highlighting the impact of scattering interference.

Findings

Interference between potential and exchange scattering modifies the A1-phase.

Spin-exchange scattering influences the temperature width of the A1-phase.

The spin structure of the A1-phase is significantly affected by scattering interference.

Abstract

The influence of spin-exchange scattering centers on the triplet Cooper pairing is considered to explore the behavior of superfluid 3He in high porosity aerogel containing 3He atoms localized at the surface of silica strands. The homogeneously located and isotropically scattering system of spin-polarized ``impurity'' centers is adopted as a simple model to investigate the contribution of spin-exchange scattering chanel for quasiparticles to the formation of non-unitary superfluid A1-phase in aerogel environment. It is demonstrated that an interference between the potential and exchange parts of quasiparticle scattering against spin-polarized ``impurity'' centers can change considerably the temperature width and the spin structure of A_{1}-phase in aerogel.