Low-dimensional ordering and fluctuations in methanol-$\ensuremath{\beta}$-hydroquinone clathrate studied by x-ray and neutron diffraction

Low-dimensional ordering and fluctuations in methanol- $β$ -hydroquinone clathrate studied by x-ray and neutron diffraction

Maikel C. Rheinstädter, Mechthild Enderle, Axel Klöpperpieper, and Klaus Knorr

Phys. Rev. B 71, 014109 – Published 18 January 2005

Abstract

Methanol- $β$ -hydroquinone clathrate has been established as a model system for dielectric ordering and fluctuations and is conceptually close to magnetic spin systems. In x-ray and neutron diffraction experiments, we investigated the ordered structure, the one-dimensional (1D) and the three-dimensional critical scattering in the paraelectric phase, and the temperature dependence of the lattice constants. Our results can be explained by microscopic models of the methanol pseudospin in the hydroquinone cage network, in consistency with previous dielectric investigations. A coupling of the 1D fluctuations to local strains leads to an anomalous temperature dependence of the 1D lattice parameter in the paraelectric regime.

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Received 31 May 2004

DOI:https://doi.org/10.1103/PhysRevB.71.014109

Authors & Affiliations

Maikel C. Rheinstädter^*

Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France and Technische Physik, Universität des Saarlandes, PSF 1551150, 66041 Saarbrücken, Germany

Mechthild Enderle

Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156,38042 Grenoble Cedex 9, France

Axel Klöpperpieper and Klaus Knorr

Technische Physik, Universität des Saarlandes, PSF 1551150, 66041 Saarbrücken, Germany

^*Present address: Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France. Electronic address: rheinstaedter@ill.fr

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Vol. 71, Iss. 1 — 1 January 2005

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Physical Review B

covering condensed matter and materials physics

Low-dimensional ordering and fluctuations in methanol- $β$ -hydroquinone clathrate studied by x-ray and neutron diffraction

Maikel C. Rheinstädter, Mechthild Enderle, Axel Klöpperpieper, and Klaus Knorr

Phys. Rev. B 71, 014109 – Published 18 January 2005

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review B

covering condensed matter and materials physics

Low-dimensional ordering and fluctuations in methanol-β-hydroquinone clathrate studied by x-ray and neutron diffraction

Maikel C. Rheinstädter, Mechthild Enderle, Axel Klöpperpieper, and Klaus Knorr

Phys. Rev. B 71, 014109 – Published 18 January 2005

Abstract

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Low-dimensional ordering and fluctuations in methanol- $β$ -hydroquinone clathrate studied by x-ray and neutron diffraction