Abstract
The nonlinear dielectric susceptibility of SrTiO3 is studied experimentally. Intense higher-order harmonics of the polarization, whose amplitudes grow with decreasing temperature and saturate at T<4 K, are observed in the temperature range T<50 K. Hysteresis phenomena, differences in the zero-field cooling (ZFS) and field cooling (FC) regimes for the higher-order harmonics, are observed when a constant electric field is applied. The existence in SrTiO3 of a strongly frustrated state, which arises when the interaction of the structural and ferroelectric order parameters is taken into account, is proposed. The low-temperature state of SrTiO3 is analyzed on the basis of a phase diagram which is similar to that of a spin glass [S. Kirkpatrick and D. Sherington, Phys. Rev. B 17, 4384 (1978); J. R. L. De Almeida and D. J. Thouless, J. Phys. A 11, 983 (1978)].
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Pis’ma Zh. Éksp. Teor. Fiz. 63, No. 8, 634–639 (25 April 1996)
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Golovenchits, E.I., Sanina, V.A. & Babinskii, A.V. Nonlinear dielectric susceptibility in SrTiO3 and possible nature of the low-temperature phase. Jetp Lett. 63, 674–679 (1996). https://doi.org/10.1134/1.567134
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DOI: https://doi.org/10.1134/1.567134