EPR study of the low temperature ferroelectric phase transition in Cu doped Rb2ZnCl4 single crystals |
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Authors: | Mariana Stefan Sergiu V Nistor Dirk SchoemakerIoan Ursu |
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Institution: | 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 |
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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. |
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Keywords: | 76 30 Fc 77 80 Bh |
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