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- W2010423610 abstract "The optical second-harmonic generation is an experimental probe almost ideally suited to the investigation of the weakly discontinuous phase transition in ammonium chloride. With the aid of this method, the temperature dependence of the order parameter of the phase transition can be measured very precisely; this has been done in the present paper for N${mathrm{D}}_{4}$Cl under atmospheric pressure. Under these conditions the deuterated material is much closer to its multicritical point, in contradistinction to normal N${mathrm{H}}_{4}$Cl (temperature hysteresis ensuremath{sim}30 mK versus ensuremath{sim}400 mK for N${mathrm{H}}_{4}$Cl at atmospheric pressure). Theoretical temperature dependences of the order parameter were fitted to the experimental data which can be derived from the classical Landau theory of discontinuous phase transitions and correspond to different types of multicritical points. In this connection, a temperature dependence of coefficients of higher order in the Landau expansion of the free energy has also been considered, but was found to be negligible for our experiments. Whereas in the case of N${mathrm{H}}_{4}$Cl under atmospheric pressure it was not possible to decide between a tetracritical or a pentacritical point from the available experimental results, in the case of N${mathrm{D}}_{4}$Cl the fitting calculations strongly support the existence of a tetracritical point for ammonium chloride. By this hypothesis, our measurements of the order parameter as a function of temperature for N${mathrm{D}}_{4}$Cl and those published previously for N${mathrm{H}}_{4}$Cl as well can be described optimally and without systematic deviations." @default.
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- W2010423610 date "1981-01-01" @default.
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- W2010423610 title "Second-harmonic generation and the type of multicritical point in NDCl4" @default.
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- W2010423610 doi "https://doi.org/10.1103/physrevb.23.162" @default.
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