Strain-induced quadrupolar ordering of dipole-glass-like ${\mathrm{K}}_{1\mathrm{-}\mathrm{x}}$${\mathrm{Li}}_{\mathrm{x}}$${\mathrm{TaO}}_3$

Linear birefringence measurements on dipole-glass-like ${\mathrm{K}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Li}}_{\mathrm{x}}$ ${\mathrm{TaO}}_3$ with x=0.011, 0.016, and 0.022 reveal logarithmic time dependences of long-range dipolar (〈$P_z^2$〉) ordering due to natural built-in strains at low temperatures. This explains recent observations of time-dependent elastic-neutron-scattering intensities of an x=0.017 sample, rapidly cooled below its glass temperature. For x=0.022 both dipole-glass and ferroelectric-domain state properties are found as predicted previously.