%0 Journal Article
%T Memory in the aging of a polymer glass
%A L. Bellon
%A S. Ciliberto
%A C. Laroche
%J Physics
%D 1999
%I arXiv
%R 10.1209/epl/i2000-00368-1
%X Low frequency dielectric measurements on plexiglass (PMMA) show that cooling and heating the sample at constant rate give an hysteretic dependence on temperature of the dielectric constant $\epsilon$. A temporary stop of cooling produces a downward relaxation of $\epsilon$. Two main features are observed i) when cooling is resumed $\epsilon$ goes back to the values obtained without the cooling stop (i.e. the low temperature state is independent of the cooling history) ii) upon reheating $\epsilon$ keeps the memory of the aging history ({\it Memory}). The analogies and differences with similar experiments done in spin glasses are discussed.
%U http://arxiv.org/abs/cond-mat/9906162v3