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J. Leist, H. Gibhardt, K. Hradil, G. Eckold:
"Electric field induced anomalies in ferroelectric K2SeO4";
Journal of Physics: Condensed Matter, 20 (2008), 41; 1 - 10.

Journal of Physics: Condensed Matter
Electric field induced anomalies in ferroelectric K2SeO4
J Leist, H Gibhardt, K Hradil and G Eckold

Published 16 September 2008 . IOP Publishing Ltd
Journal of Physics: Condensed Matter, Volume 20, Number 41
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Institute of Physical Chemistry, University of Göttingen, Germany

Dates
Received 23 May 2008
In final form 1 August 2008
Published 16 September 2008
Citation
J Leist et al 2008 J. Phys.: Condens. Matter 20 415209

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DOI
https://doi.org/10.1088/0953-8984/20/41/415209

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Abstract
The lock-in transition of K2SeO4 at 93.2 K was studied using high-resolution γ-ray diffraction, in situ dielectric measurements and neutron scattering. The phase transition shows a coexistence regime of 1.0 K with clearly resolved incommensurate and commensurate satellite reflections. Within a temperature interval of several K above the lock-in transition, strong third order satellites are observed, indicating a pronounced squaring of the modulation wave. Under the influence of high electric fields an intermediate phase is observed, which is characterized by a diffuse intensity distribution. In addition, the dielectric permittivity exhibits two maxima, indicating the existence of two separate phase transitions. This behaviour is attributed to distortions of the discommensuration lattice and pinning of the discommensurations by accumulated charged defects. It seems to be characteristic for modulated ferroelectrics of the A2BX4 group, since a similar behaviour is also found in isostructural Rb2ZnCl4 and K2ZnCl4. The soft-mode dynamics close to Tc is found to be essentially independent of the electric field and not affected by the discommensuration lattice.

http://dx.doi.org/10.1088/0953-8984/20/41/415209

https://publik.tuwien.ac.at/files/publik_289617.pdf