Abstract
A thermodynamic investigation on the electronic properties of several organic salts based on BEDT-TTF and DCNQI molecules is performed by means of high-precision specific-heat measurements in the temperature range between 0.9 and 6 K. The electronic specific-heat coefficient γ for dimeric insulators is almost 0 mJ/mol K 2, which is explained by the picture of Mott–Hubbard gap in the effectively half-filled band. The non-dimeric salt of (DI-DCNQI) 2Ag, on the other hand, shows an unexpectedly large γ value of about 30–40 mJ mol −1 K −2 representing the existence of large low-energy excitations from the charge-ordered insulating ground state. The difference of the low-temperature electronic specific-heat behavior between the dimeric and non-dimeric systems demonstrates that manifestation of electron correlation effects is qualitatively different in these systems.
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