Evidences for 1-D CDW fluctuations and 3-D ordering in the IR spectra of the organic conductor (FA)2PF6

Autor:	V. N. Denisov, D. Berner, J. Gmeiner, G. Scheiber, H. P. Geserich, B. N. Mavrin, K. Widder, M. Schwoerer, V. M. Burlakov
Rok vydání:	1996
Předmět:	Phase transition Materials science Tricritical point Condensed matter physics Peierls transition Infrared spectroscopy Conductivity Atmospheric temperature range Condensed Matter Physics Optical conductivity Electronic Optical and Magnetic Materials Conductor
Zdroj:	Ferroelectrics. 176:321-328
ISSN:	1563-5112 0015-0193
Popis:	The broad band spectrum of optical conductivity of the quasi one-dimensional organic conductor (FA)2PF6 has been investigated in a wide temperature range including the Peierls transition temperature Tp = 180 K. The semiconducting gap value has been observed both at 10 K (∼143 meV) and at 300 K (∼80 meV). We show in the present study that in contrast to the dc conductivity the electronic part of dynamical conductivity at energies 0.02–0.06 eV is mainly driven by 1-D fluctuations in a wide temperature range and does not show any distinct crossover to 3-D behavior below Tp , while this crossover is certainly observed in the temperature dependence of the intensity of intramolecular vibrations. From the latter the temperature dependence of the order parameter for the Peierls transition has been determined to be Δ(T) ∼ (Tp — T)1/4 what is characteristic for a second order phase transition near tricritical point.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::32e0eb2fa924e79b696e5e4f3a15bab4 https://doi.org/10.1080/00150199608223619 Zobrazit plný text záznamu