Transverse field effect close to the critical point in the TGS ferroelectric

Boguslaw Fugiel (1) , Toshio Kikuta (2) , Katarzyna Wojtkow (3)

1 Institute of Physics
2 University of Toyama
3 University of Silesia in Katowice

A hysteresis loop was measured in a round plate sample of the triglycine sulphate (TGS) ferroelectric with two measurement and one side electrode. Due to a non-zero electric potential Vs applied to the side electrode the hysteresis loop gradually decayed on time. It has been shown that the higher the Vs value, the shorter time td is required for the hysteresis loop to disappear. The value of 1/td has turned out to be proportional to the electric potential Vs generating a transverse field at a constant temperature. Within the limits of experimental errors, the inverse of the slope of the dependence 1/td versus Vs is proportional to the difference Tc−T. A relation between the temperature T, the spontaneous polarization P+- (positive or negative) and the freezing parameter f has been proposed. The parameter f describes the influence of the transverse electric field. Arguments in favour of considering the transverse field effect as occurring due to free electric charges flowing into the crystal have been given. A method by means of which the parameters of the hysteresis loop can be easily adjusted by an electric potential of an additional side electrode has been proposed.

Mots clés: Physical Sciences

Domaines: Matière Condensée [cond-mat]

Boguslaw Fugiel, Toshio Kikuta, Katarzyna Wojtkow. Transverse field effect close to the critical point in the TGS ferroelectric. Philosophical Magazine, 2011, pp.1. ⟨10.1080/14786435.2011.594815⟩. ⟨hal-00717920⟩