Schematic view of the experimental setup (see text).
Experimental amplitude (filled symbols) and phase (open symbols) of the signal V (a) and VR (b) as a function of temperature. The modulation frequency was f = 600 Hz.
Amplitude (filled symbols) and phase (open symbols) of the normalized signal VN vs temperature obtained from the data reported in Fig. 2 .
Real (a) and imaginary (b) parts of the effusivity squared vs temperature obtained from the data shown in Fig. 3 with the effect of contact resistance (filled symbols) and without (open symbols).
Real (a) and imaginary (b) parts of the thermal effusivity squared as function of temperature obtained for f = 0.6 Hz (squares), 6 Hz (triangles), 60 Hz (circles), 600 Hz (diamonds), 15 kHz (stars). Larger open squares and circles represent, respectively, data at 3.5 Hz from Ref. 14 and at 120 Hz from Ref. 13 .
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