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It is shown that a sufficiently strong external electric field causes adecrease in the transition temperature of ferroelectric, antiferroelectric, andmetal-insulator transitions. The temperature dependence of the criticalelectric field suppressing a low-temperature phase is obtained. The relationbetween the low-temperature charge gap (the band gap) in the insulating phaseand the metal-insulator transition temperature is also inferred.

Effect of strong electric fields on ferroelectric and metal-insulator transitions