Study by brillouin scattering of the C33 constant of thiourea submitted to an electric field |
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Authors: | AX Cao S Krichene G Hauret JP Benoit JP Chapelle |
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Institution: | Laboratoire de Physique Cristalline, (Equipe de recherche associée au CRNS No. 13), Université de Paris-sud, 91405 Orsay, Cédex France |
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Abstract: | The C33 constant is discontinuous for the lock-in transition at T1 = 169 K. The variation ΔT1 of the temperature of transition is a linear function of the applied electric field E and we find .Above a mean field E = 10 kV cm?1 the transition observed for a first heating spreads on several degrees because damages appear in the incommensurate phase and the electric field becomes inhomogeneous.The results obtained at low fields are in very good accordance with the value of calculated from the Clapeyron formula.Taking into account of the incommensurability of the phase above T1, it can be shown that The knowledge of the spontaneous polarisation P0 gives for the Curie constant C = 2.1 × 103 K in qualitative agreement with the value deduced from measurements of the dielectric constant in the ferroelectric direction. |
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