Comment on: "Phenomenological model of Dynamic Nonlinear Response in Relaxor Ferroelectrics
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❄️ cond-mat
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dynamicferroelectricsrelaxorresponsecommentequationlandau-khalatnikovmodel
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In a recent paper (A.E. Glazounov and A.K. Tagantsev, Phys.Rev. Lett. 85, 2192 (2000)) it has been proposed a phenomenological model of the dynamic non-linear response in relaxor ferroelectrics based on the averaging of the Landau-Khalatnikov equation over the distribution of the relaxation times. The purpose of the present comment is to clarify the physical assumptions involved in the Glazounov-Tagantsev approach and show that models based on the Landau-Khalatnikov equation can not describe properly the dynamic response in relaxor ferroelectrics.
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