EPR study of the low temperature ferroelectric phase transition in Cu doped Rb<sub>2</sub>ZnCl<sub>4</sub> single crystals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

EPR study of the low temperature ferroelectric phase transition in Cu doped Rb₂ZnCl₄ single crystals

Authors:	Mariana Stefan Sergiu V. Nistor Dirk SchoemakerIoan Ursu

Affiliation:	^a National Institute for Materials Physics, Laboratory 190, P.O. Box MG-7 Magurele, Bucuresti RO-77125, Romania ^b Physics Department, University of Antwerp (UIA), B-2610 Antwerp, Wilrijk, Belgium ^c Romanian Academy, Calea Victoriei no.125, Bucuresti, Romania

Abstract:	Temperature dependent EPR measurements on copper doped Rb₂ZnCl₄ single crystals allowed us to evidence and study the P2₁cn↔C1c1 structural phase transition that takes place in this compound at 74.6 K. From the two types of Cu²⁺ centers localized at different anionic sites, called Cu²⁺(I) and Cu²⁺(II), which are formed in this compound, only the Cu²⁺(II) centers exhibit observable changes in their EPR spectra, attributable to the symmetry lowering. The observed changes have been related to the soft-mode responsible for the structural phase transition.

Keywords:	76.30.Fc 77.80.Bh
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