Time relaxation of permittivity in [(CH3)2NH2]3CuCl5 crystal under external electric field |
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| Authors: | Yu Eliyashevskyy Z Czapla S Dacko |
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| Institution: | 1. Physics Department , Ivan Franko National University of Lviv , Dragomanova St. 50, 79-005 Lviv, Ukraine eliashyur@yahoo.co.uk;3. Department of Physics , Opole University of Technology , Ozimska St. 75, 45–271, Opole, Poland;4. Institute of Experimental Physics, University of Wroc?aw , Pl. M. Borna 9, 50–204, Wroc?aw, Poland;5. Institute of Experimental Physics, University of Wroc?aw , Pl. M. Borna 9, 50–204, Wroc?aw, Poland |
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| Abstract: | Continuation of our previous studies connected with dielectric properties of tris-dimethylammoniumpentachlorocuprate crystal (CH3)2NH2]3CuCl5 crystal under the influence of electric field are presented in this article. We studied the time dependence of the permittivity under the influence of electric field at constant temperatures above T c. In experiment, slow but significant decrease of permittivity was observed, which can be described with two main relaxation processes. The observed dielectric behavior can be related to the coexistence of phases and slow transition to ferroelectric one through long-time metastable states connected with the presence of incommensurate phase in the studied crystal. The coexistence of phases and slow transition was confirmed from the appearance of induced polarization under external electric field, measured as depolarization current. |
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| Keywords: | commensurable–incommensurable transitions phase transitions electric permittivity polarization |
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