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Theoretical study of dielectric susceptibility in ferroelectric thin films

Theoretical study of dielectric susceptibility in ferroelectric thin films,10.1016/S0375-9601(01)00654-5,Physics Letters A,Pengfei Nie,Jian Zhang,Zhen

Theoretical study of dielectric susceptibility in ferroelectric thin films  
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Based on a pseudospin–phonon interaction model dielectric susceptibility in ferroelectric thin films was studied by using double-time Green's functions method. The dielectric susceptibility peak shifts up to higher temperature with increasing the pseudospin–phonon coupling. Critical pseudospin–phonon couplings were obtained. Below the critical coupling Curie temperature for the film is lower than that for the bulk and the transition temperature for the film decreases with decreasing the film thickness; above the critical coupling Curie temperature for the film is higher than that for the bulk and the transition temperature for the film increases with decreasing the film thickness.
Journal: Physics Letters A - PHYS LETT A , vol. 290, no. 3, pp. 176-180, 2001
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