Glass state of superfluid 3He-A in aerogel

TL;DR

This paper explores the glass states of superfluid helium-3 in aerogel, showing how external factors like magnetic fields and currents influence its superfluidity and phase transitions.

Contribution

It introduces the concept of glass states in superfluid helium-3 confined in aerogel and examines how external stimuli can restore or alter superfluidity.

Findings

Glass states are nonsuperfluid in the long wavelength limit.

Small mass currents can restore superfluidity.

Transitions can be triggered by magnetic fields and magnetization angles.

Abstract

Glass states formed in the superfluid $^3$He confined in aerogel are discussed. If the short range order corresponds to the A-phase state, the glass state is nonsuperfluid in the long wave length limit. The superfluidity can be restored by application of a small mass current. Transitions between the superfluid and nonsuperfluid glass states can be triggered by small magnetic field and by the change of the tipping angle of magnetization in NMR experiments.