Pretransitional cooperative dynamics in the incommensurate freezing of DRAPD glass: a neutron scattering study
Laboratoire Léon Brillouin CEA-CNRS , CE Saclay
F-91191 Gif-sur-Yvette Cedex, France
2 Laboratoire de Science des Matériaux Vitreux (Associated with the Centre national de la recherche scientifique, No. 1119.) , Université de Montpellier II Case 069, F-34095 Montpellier Cedex 05, France
Accepted: 24 November 1995
Inelastic neutron scattering measurements are reported for Rb0.55 (ND4)0.45D2PO4 at temperatures well above the TDIC where diffuse incommensurate freezing at wave vector occurs. They reveal, in addition to a central peak, a branch whose relaxation rate is smallest at and which softens on cooling. A weak pseudo-antiferroelectric diffuse scattering is also observed that freezes near TDIC. A scenario is proposed to describe comprehensively the freezing of these proton glasses.
PACS: 64.70.Pf – Glass transitions / 61.12.-q – Neutron diffraction and scattering / 77.90.+k – Other topics in dielectrics, piezoelectrics, and ferroelectrics and their properties
© EDP Sciences, 1996