Nutations of spin in the quasi-isotropic superfluid A-like phase of 3He

TL;DR

This paper investigates the spin nutation modes in the quasi-isotropic superfluid A-like phase of 3He, highlighting how magnetic susceptibility anisotropy influences these oscillations and discussing their observability.

Contribution

It presents a simplified form of the order parameter and analyzes the impact of susceptibility anisotropy on spin oscillation frequencies, including nutation-like modes.

Findings

Anisotropy significantly affects low-frequency spin modes.

Nutation-like oscillations are predicted in the superfluid phase.

Discussion on potential experimental observation.

Abstract

The order parameter of the quasi-isotropic superfluid A-like phase of 3He is rewritten in a simple form. Effect of anisotropy of magnetic susceptibility of this phase on the frequencies of the spatially uniform oscillations of spin and the spin part of its order parameter are found. Anisotropy of susceptibility has pronounced effect on the low-frequency mode, which is analogous to nutations of the asymmetric top. Possibility of observation of the nutation-like mode is discussed.