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VOLUME 49 (1989) | ISSUE 11 | PAGE 600
Field-even current in ferroelectrics
A mechanism is proposed for the field-even current which has recently been observed in a ferroelectric: a scattering of carriers by charged centers which create a local asymmetry of the polarization P. The current is expressed in terms of the coefficients of an expansion of the free energy in P. These coefficients determine the critical temperature behavior of the current. A negative transverse conductivity is predicted in the paraelectric phase.