The temperature dependence of the field-cooled and zero-field cooled static dielectric susceptibilities of the deuteron glass ${\mathrm{Rb}}_{0.4}$(${\mathrm{ND}}_4$${)}_{0.6}$${\mathrm{D}}_2$${\mathrm{PO}}_4$ has been determined. Whereas above the freezing temperature ${\mathit{T}}_{\mathit{f}}$ the two susceptibilities are equal, a splitting of the two branches as well as a remanent polarization is observed below ${\mathit{T}}_{\mathit{f}}$. The fact that this splitting takes place demonstrates the occurrence of a freezing transition on crossing the Almeida-Thouless-like line.

• Received 26 October 1990

DOI:https://doi.org/10.1103/PhysRevLett.66.2368