We have measured the heat capacity of TTF-TCNQ in the vicinity of the low-temperature transitions. High-resolution measurements, realized by the improvement of standard relaxation techniques, lead to the observation of four phase transitions at 52.6, {~} 49-48, 46, and 37 K. The new transition observed at 46 K is tentatively attributed to the softening of 0.59b* mode in TTF-TCNQ.
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Djurek et al. (1977) studied this question.
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