Geodesic
Polariton states in ferroelectrics of the order-disorder type
Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 1, pp. 106-117

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For the example of a simple model, a study is made of the dynamics of an order-disorder ferroelectric with allowance for retardation effects. It is shown that the spectrum of such ferroelectrics contains excitations that are a “mixture” of the ferroelectric branch and photons (the so-called polariton states). The excitation spectrum and its damping is analyzed, and the consequences of allowing for retardation effects and their possible experimental verification are discussed. 
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     author = {Yu. V. Kozitskii and R. R. Levitskii and I. V. Stasyuk},
     title = {Polariton states in ferroelectrics of the order-disorder type},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     volume = {39},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_39_1_a10/}
}
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Yu. V. Kozitskii; R. R. Levitskii; I. V. Stasyuk. Polariton states in ferroelectrics of the order-disorder type. Teoretičeskaâ i matematičeskaâ fizika, Tome 39 (1979) no. 1, pp. 106-117. http://geodesic.mathdoc.fr/item/TMF_1979_39_1_a10/