Heat-flow induced anomalies in superfluidHe4nearTλ

Abstract

We study the effect of a stationary heat current Q on superfluid ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ in a homogeneous metastable state near ${\mathit{T}}_{\lambda }$(Q). On the basis of a renormalization-group calculation we predict a sizable enhancement of the specific heat ${\mathit{C}}_{\mathit{P}}$(Q) and a weak depression of the superfluid density ${\mathrm{\rho }}_{\mathit{s}}$(Q) up to a critical heat current ${\mathit{Q}}_{\mathit{c}}$(T) where ${\mathit{C}}_{\mathit{P}}$ and ${\mathrm{\rho }}_{\mathit{s}}$ exhibit cusplike anomalies.