Critical phenomena in higher dimensional spaces : The hexagonal-to-orthorhombic phase transition in aperiodic n-nonadecane/urea. - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Critical phenomena in higher dimensional spaces : The hexagonal-to-orthorhombic phase transition in aperiodic n-nonadecane/urea.

Résumé

Upon cooling, the aperiodic inclusion compound n-nonadecane/urea presents a hexagonal-to-orthorhombic group-subgroup phase transition at Tcl that increases the structure's superspace dimensionality from four to five. This paper reports on pretransitional phenomena in such a high-dimensional space, generalizing the critical results previously reported at a lower dimensionality. Very high-resolution diffraction data reveal anomalously large correlation lengths along the aperiodic direction, with all correlation lengths diverging at Tcl. This could be explained by low-frequency phason excitations that soften at Tcl at the critical wave vector, in accordance with an increase in the critical diffuse scattering intensity.

Dates et versions

hal-00825698 , version 1 (24-05-2013)

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Citer

Céline Mariette, Laurent Guérin, Philippe Rabiller, Claude Ecolivet, P. Garcia-Orduna, et al.. Critical phenomena in higher dimensional spaces : The hexagonal-to-orthorhombic phase transition in aperiodic n-nonadecane/urea.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (10), pp.104101. ⟨10.1103/PhysRevB.87.104101⟩. ⟨hal-00825698⟩
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