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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

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
Physique/Articles anciens

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
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