Effect of zero-point energy on the dielectric behavior of strontium titanate

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Abstract

Barrett formula has been obtained in the framework of the effective field approach by including the zero-point energy. By fitting with experimental data of dielectric constant of SrTiO3, we find that they agree in the whole temperature range fairly well if the zero-point energy is assumed to change from a small value at low temperature to a large value at high temperature.

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Acknowledgements

This work was supported by a grant for State Key Program for Basic Research of China under Grant No. G1998061408.

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