Spectral selectivity in the slow ${\beta}$-relaxation of a molecular glass

Author： Richert R.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|54|6|767-773

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.54, Iss.6, 2010-03, pp. : 767-773

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Abstract

The time-resolved electric-field relaxation in glassy D-sorbitolis measured by dielectric hole-burning, i.e. with andwithout a preceding high electric sinusoidal burn field. Thequestion is whether the burn-induced modifications of theresponse are frequency-selective (dielectric “holes”) and thusindicative of heterogeneous dynamics, where slow and fastresponses coexist in the material. For burn fields between 250and 440$\un{kV/cm}$ such holes in the responses are observed, whose positions shift linearly with the inverse burn frequency.Recovery time measurements indicate that these modifications ofthe Johari-Goldstein process in glassy D-sorbitol are long lived.

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