Thermodynamic investigation of the charge-ordered insulating state of the quasi-one-dimensional organic system (DI-DCNQI)2Ag.
Heat capacity measurements of a charge-ordered organic conductor (DI-DCNQI)2Ag have been performed in a temperature range between 0.3 and 14 K. We found no thermal anomaly at the Néel temperature ( T(N) = 5.5 K) but instead a T-linear term suggestive of the spin excitations of one-dimensional character in the charge-ordered insulating state. The analysis of the T-linear term and the excess entropy indicates that the charge fluctuations in the charge-ordered state influence the growth of spin excitations at elevated temperatures, which seems to be a peculiar aspect of a 1D charge-ordered system.
Nakazawa
Yasuhiro
Y
Research Center for Molecular Thermodynamics, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
Seki
Mitsuro
M
Saito
Kazuya
K
Hiraki
Ko-ichi
K
Takahashi
Toshihiro
T
Kanoda
Kazushi
K
Sorai
Michio
M