E.P.R. investigation of the incommensurate phase of ThBr4 : Gd3+, through fourth order spin-crystal field interaction

Hubert, S.; Eméry, J.; Rousseau, Jean‐Jacques; Fayet, J. C.

doi:10.1051/jphyslet:019820043022081500

Cited by 7 publications

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“…a typical incommensurate line shape. This type of spectra have been previously analysed [5]. The splitting between the singularities mainly arises from the rotational component of the displacement field and exhibits a critical behaviour AH oc A oc (TI -T)~ with # = 0.34 ± 0.02.…”

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confidence: 96%

“…ThBr4 (/3) undergoes a normal to incommensurate structural phase transition at 95 K [1][2][3][4][5][6]. Neutron scattering data [3] give a precise description of the soft coordinates and of the associated displacement field below 1,.…”

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confidence: 99%

“…In a previous work we have shown the sensitivity of the E.P.R. G d3 + -n. n. n Brvacancy to the transition [5].…”

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confidence: 99%

“…In ThBr4 : Gd3+, one observes several paramagnetic centres : Gd3+ substituted for Th4+ at D2d sites, Gd3 + associated to nearest neighbour (n.n) Brvacancy, Gd3 + associated to next nearest neighbour (n.n.n) Brvacancy. This last point defect is the most easily tractable to study the phase transition [5] by E.P.R. We shall consider the associated high field E.P.R.…”

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confidence: 99%

“…We shall consider the associated high field E.P.R. line corresponding to Mg = 5 H ~ , for H in the (001) plane at about 25° away from [100], [5].…”

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confidence: 99%

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

1984

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2014 Récemment la coexistence de raies « comme normales » et incommensurables dans les spectres R.M.N. de 87Rb, a été observée au-dessous de T, dans Rb2ZnBr4, et a été interprétée en termes d'ondes stationnaires de fluctuations de phase entre des défauts épingleurs. Nous analysons un effet identique dans les spectres R.P.E. de ThBr4 : Gd3+. Nous excluons un effet extrinsèque de la sonde E.P.R. qui ne manifeste aucune tendance à accrocher la phase et nous montrons que des fluctuations de phase inhomogènes peuvent rendre compte des observations. Une application sommaire du modèle développé par Blinc indique que le « pinning » apparait probablement sur les dislocations.Abstract. 2014 Recently, the coexistence of « normal-like » and incommensurate 87Rb 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.

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confidence: 96%