Electronic Resource
Springer
The European physical journal
25 (2002), S. 223-231
ISSN:
1434-6036
Keywords:
PACS. 75.10.Nr Spin-glass and other random models – 77.22.Gm Dielectric loss and relaxation – 64.70.Pf Glass transitions – 05.20.-y Classical statistical mechanics
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: A new kind of memory effect on low frequency dielectric measurements on plexiglass (PMMA) is described. These measurements show that cooling and heating the sample at constant rate give an hysteretic dependence on temperature of the dielectric constant ε. A temporary stop of cooling produces a downward relaxation of ε. Two main features are observed (i) when cooling is resumed ε 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 ε keeps the memory of all the cooling stops (Advanced memory). The dependence of this effect on frequency and on the cooling rate is analyzed. The memory deletion is studied too. Finally the results are compared with those of similar experiments done in spin glasses and with the famous experiments of Kovacs.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e20020025
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