HAL : jpa-00232399, version 1

DOI : 10.1051/jphyslet:019840045013069300

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Journal de Physique Lettres 45, 13 (1984) 693-700

Large phase fluctuations near TI and phase pinning in incommensurate ThBr4 : Gd3+ through E.S.R. measurements

J. Emery, S. Hubert1, J.C. Fayet

(1984)

Recently, the coexistence of « normal-like » and incommensurate 87 Rb N.M.R. lines have been observed in Rb2ZnBr4 below TI, and has been interpreted in terms of a standing wave regime of phase fluctuations between pinning defects. We analyse a similar effect in the E.P.R. spectra of ThBr4 : Gd3+. We rule out the possibility of an extrinsic pinning effect due to the E.P.R. probe and we show that inhomogeneous phase fluctuations can account for the observation. A crude application of the model developed by Blinc indicates that the average distance between pinning centres is compatible with their being dislocations.

1 :	IPNO - Institut de Physique Nucléaire d'Orsay

Domaine

:

Physique/Articles anciens Physique/Physique/Chimie-Physique

Mots Clés : commensurate incommensurate transformations – dislocations – gadolinium – impurities – paramagnetic resonance of rare earth ions and impurities – thorium compounds – EPR spectra – incommensurate phase – phase pinning – ThBr sub 4 :Gd sup 3+ – inhomogeneous phase fluctuations – pinning centres – dislocations

jpa-00232399, version 1

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Contributeur : Archives Journal de Physique <>

Soumis le : Dimanche 1 Janvier 1984, 08:00:00

Dernière modification le : Mardi 25 Mars 2008, 21:02:30