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5 Experimental Verification of Dynamic Scaling Theories and Discussions

Figure 5.21: Same scaling function plot as in Fig.(5.20): but taking an additional Debye term into account Eq.(4.26).

5.5.2 Amplitude SBF and coupling constant g

The discussion of the quantities like the critical amplitude SBF as well as the coupling constant is interesting, because of their direct connection to thermodynamics. Further- more, if heat capacity data as well as the fluctuation correlation length amplitudes ξ0 are available, comparison of the amplitude values SBF and of the coupling constant g from ultrasonic measurements with results from thermodynamic calculations is possible. From the amplitude parameter, A(T), of the critical part in the ultrasonic spectra, the amplitude SBF can be derived, which according to Eq.(4.17) is related to the adiabatic coupling con- stant, g. The determination of the coupling constant will be presented using (ME-HEX) as an example.

Eq.(4.17) can be rewritten to yield the coupling constant g as a function of SBF:

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