Finite block pseudo-spin approach of proton glass. (August 2016)

• Record Type: Journal Article
• Authors: Lee, Kwang-Sei; Koo, Je Huan; Lee, Cheol Eui
• Is Part Of: Solid state communications. Volume 240(2016)
• Page Start: 10
• Page End: 14
• Publication Date: 2016-08
• Subjects: D. Dielectric properties -- D. Ferroelectricity -- D. Phase transitions; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.04.016
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: We herein propose an alternative phenomenology to explain the phase of proton glass by reference to finite block spin theory in magnetism, in which the phase may be considered as being a short-range ferroelectric ordering of block pseudo-spins comprised of random pseudo-spins that have a majority of individual pseudo-spins in a given sense. By making use of the Curie law of block pseudo-spins, we obtained the dielectric susceptibility for the lower and higher temperature approximations of the Brillouin function . The experimental results for the susceptibility in hydrogen-bonded mixed crystals of ferroelectric RbH2 P(As)O4 and antiferroelectric NH4 H2 P(As)O4 were thus fitted fairly well at low temperatures in the proton glass phase whereas some deviation from our formulation was seen at high temperatures in the paraelectric phase. Highlights: The proton glass phase in hydrogen-bonded crystals. Ordering between block pseudo-spins comprised of random pseudo-spins. Dielectric susceptibility for the approximations of the Brillouin function. The freezing temperature of glass transition in Rb1− x (NH4 ) x H2 PO4 .