Local-polarization distribution in deuteron glasses

Abstract

It is shown that quadrupole-perturbed nuclear magnetic resonance provides a powerful technique to determine the local-polarization distribution and its second moment, the Edwards-Anderson order parameter in proton and deuteron glasses. The experimentally determined local-polarization distributions show the characteristic features predicted by a deuteron-glass model with infinitely ranged random-bond interactions in the presence of quenched random fields. The measurements demonstrate that we deal in ${\mathrm{Rb}}_{0.56}$(${\mathrm{ND}}_4$ ${)}_{0.44}$ ${\mathrm{D}}_2$ ${\mathrm{PO}}_4$ with a random-field smearing of a random-bond-type pseudo-spin-glass transition and not with a random-field-type freezing or a classical random-bond-type spin-glass transition.