Geodesic
Isolated and isothermal susceptibilities of a~pseudospin-phonon system
Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 1, pp. 112-120

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A study is made of the model of a phonon system coupled to a two-level subsystem containing a substitutional impurity. It is shown that the isolated and isothermal susceptibilities may have different forms in both the ferrophase and the paraphase. As a result, there is an additional concentration dependence of the energy of the coupled pseudospin-phonon excitations and a central peak in the neutron or light scattering cross sections. The results are discussed for the example of the ferroelectric $\operatorname{K(H_{1-x}D_x)_2PO_4}$. 
@article{TMF_1981_48_1_a11,
     author = {V. L. Aksenov and Yu. Shraiber},
     title = {Isolated and isothermal susceptibilities of a~pseudospin-phonon system},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {112--120},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1981_48_1_a11/}
}
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V. L. Aksenov; Yu. Shraiber. Isolated and isothermal susceptibilities of a~pseudospin-phonon system. Teoretičeskaâ i matematičeskaâ fizika, Tome 48 (1981) no. 1, pp. 112-120. http://geodesic.mathdoc.fr/item/TMF_1981_48_1_a11/