Local-polarization distribution in deuteron glasses

Thermodynamics and complex dielectric permittivity of mixed crystals of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type

“…At x = 0.22, the theoretical curve 3 well describes the experimental data of [15]. At the same time, at x = 0.44, our results accord with the data of [14], but are lower than the values of [15]. We think that the reason for this is an incorrect determination of composition in [15].…”

“…Investigations of the state of proton glasses in Rb 1−x (ND 4 ) x D 2 PO 4 started in [13] for x = 0.55 and [14] for x = 0.44 using the NMR method. It was shown [14] that a satisfactory description of temperature dependence of Edwards-Anderson parameter q EA (T ) is possible within the framework of a model which takes into account fluctuations of interactions between hydrogen bonds and chaotic deformational field (the random-field random-bond Sherrington-Kirkpatrick Ising model).…”

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

“…Its shape at high temperatures is close to the Gaussian one, whereas at lowering temperature or increasing h 2 i c it transforms into a two-peak curve with a minimum at h = 0. Such a shape of P (h) qualitatively agrees with the experimentally observed shape of EPR [24] and NMR [68] spectral lines. The temperature dependence of q EA calculated within the model [66] well agrees with the second moment of the distribution function of the EPR [24] and NMR [39,68] spectral lines.…”

“…Such a shape of P (h) qualitatively agrees with the experimentally observed shape of EPR [24] and NMR [68] spectral lines. The temperature dependence of q EA calculated within the model [66] well agrees with the second moment of the distribution function of the EPR [24] and NMR [39,68] spectral lines. In [25,69] for the model with Hamiltonian (1.1) at Ω i = 0, using the Glauber equation, a shape of the EPR line was calculated (a single-peak one at high temperatures and a two-peak one at low temperatures) that agrees well with the experiment in a wide temperature range (T = [10 K, 150 K]).…”

“…For Rb 1−x (ND 4 ) x D 2 PO 4 at x = 0.22 the theoretical curve 3 ( figure 5 (b)) satisfactorily describes the experimental data of [39]. At the same time, at x = 0.44 our calculations agree with the data of [68], but the obtained values are lower than those of [39] both for x = 0.44 and x = 0.22. We believe that this can be explained by an incorrectly determined composition x of the samples in [39].…”