Evidence for a glassy dynamics in (Rb-NH4)2SO4 mixed compounds

Author： D. De Sousa Meneses P.   Simon G.   Hauret M.   Maglione P.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|36|6|461-466

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.36, Iss.6, 2010-03, pp. : 461-466

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Abstract

An orientational glass behavior is evidenced in a $\rm [Rb_{0.7}(NH_4)_{0.3}]_2SO_4$ mixed crystal. Dielectric experiments (1 kHz–250 MHz) performed along the c-axis evidenced a polydispersive relaxation process. Its temperature dependence follows a Vogel-Fulcher law with a freezing temperature of 12 K.

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