  Domain walls in superfluid 3He-B have gained renewed interest in light of
experimental progress on confining helium in nanofabricated geometries. Here,
we study the effect of strong-coupling corrections on domain wall width and
interfacial tension by determining self-consistent solutions to
spatially-dependent Ginzburg-Landau equations. We find that the formation of
domain walls is generally energetically favored in strong coupling over weak
coupling. Calculations were performed over a wide range of temperatures and
pressures, showing decreasing interface energy with increasing temperature and
pressure. This has implications for the observability of such domain walls in
3He-B, which are of both fundamental interest and form the basis for
spatially-modulated pair-density wave states, when stabilized by strong
confinement.
