Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 73, Issue 8, Pages 2326-2332Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.73.2326
Keywords
organic conductors; molecular conductors; low-dimensional conductors; ET salt; Raman spectra; infrared spectra; vibrational spectra; charge order; e-mv interaction
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The polarized Raman and infrared spectra of theta-(ET)(2)CU2CN[N(CN)(2)](2) [ET = bis(ethylenedithio)tetrathiafulvalene] were measured at various temperatures below 300K. We investigated the three C=C stretching modes, V-2, V-3 and V-27. The spectral pattern is compatible with the horizontally charge-ordered state, where the site-charge distributions are +0.1(7) and +0.8(3). We have found that the vibronic V-3 bands correlate to the dihedral angles, psi, in the theta-ET salts. This relation is well reproduced by the numerical calculation based on the cluster model with C-2 symmetry. The spectral features suggest the dynamical fluctuation of nearly localized charges even above its phase transition temperature, similar to220 K.
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