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American Institute of Physics, Low Temperature Physics, 8(33), p. 684-687, 2007

DOI: 10.1063/1.2747045

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Structural phase transition in two-dimensional tetramer-cuprate Na5RbCu4(AsO4)4Cl2

Journal article published in 2007 by V. Gnezdilov, V. Bedarev, S. Gnatchenko, Y.-U. Pashkevich, M. Pashchenko ORCID, P. Lemmens, S. Zvyagin ORCID, X. Mo, W. Queen, S.-J. Hwu
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Abstract

Raman scattering and optical birefringence were used in to investigate a low-temp. phase transition in a single crystal of the 2D Na5RbCu4(AsO4)4Cl2. Phonon anomalies point to a 1st-order nature of the transition. The obsd. transition is most probably related to an order-disorder transition of the Rb ion positions along the z axis within the ionic framework of mixed alkali metal chloride lattices. (c) 2007 American Institute of Physics.