Advances in Condensed Matter Physics / 2019 / Article / Fig 6

Review Article

Survey of the Thermodynamic Properties of the Charge Density Wave Systems

Figure 6

Color on line. Temperature dependence of the measured relative velocity ∆V/V as a function of the reduced temperature . Velocity of the longitudinal mode in the (a b) plane in TiSe2 [20], 2H-TaS2 [16, 17], 2H-NbSe2 [16, 17], and TTF-TCNQ [36]. Velocity of the mode C33 measured with ErTe3 at the upper CDW phase transition TCDW = 260 K [42]. The dashed curves are calculated with the BCS theory (see (14)).

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