NDLI: Theory of the memory effect in thiourea. Defect density waves in modulated systems

Content Provider	EDP Sciences
Author	P. Lederer G. Montambaux J.P. Jamet M. Chauvin
Abstract	A simple Landau-Ginzburg theory is shown to account qualitatively and semi-quantitatively for the memory effect anomalies of the susceptibility and the birefringence in thiourea. The importance of the gradient amplitude coupling energy in thiourea is emphasized. The possibility of creating a defect-induced locked incommensurate phase around any arbitrary temperature within the modulated phase is demonstrated. Such a locked phase will appear as a consequence of the condensation of a periodic defect concentration if extrinsic mobile impurities are allowed to interact for a sufficient time with a static modulation. We briefly discuss some aspects of such defect density waves in the physics of modulated structures.
Ending Page	637
Starting Page	627
Page Count	11
File Format	HTM / HTML PDF
ISSN	0302072X
Alternate Webpage(s)	http://dx.doi.org/10.1051/jphyslet:019840045012062700
Issue Number	12
Journal	Journal de Physique Lettres
Volume Number	45
DOI	10.1051/jphyslet:019840045012062700
Language	English
Publisher	Les Editions de Physique
Publisher Date	1984-06-01
Access Restriction	Subscribed
Subject Keyword	birefringence crystal defects Ginzburg Landau theory impurities optical susceptibility organic compounds memory effect Landau Ginzburg theory susceptibility gradient amplitude coupling energy thiourea defect induced locked incommensurate phase defect density waves modulated structures
Content Type	Text
Resource Type	Article
Subject	Engineering

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