The charge-fluctuating and charge-ordered states in metallic, insulating and superconducting bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) salts are characterized through the analysis of the infrared (IR) spectral region relevant to the C––C antisymmetric stretch, b1_nu22.This spectral region shows dramatic changes in band intensity and band-shape by varying the temperature. The observed spectral features can be understood on the basis of an extension of the well-known Kubo model for the spectral signatures of an equilibrium between two states. The two-orders of magnitude increase in the IR oscillator strength of the b1_nu22 mode upon ionization has also to be taken into account.
Spectroscopic characterization of charge-order fluctuations in BEDT-TTF metals and superconductors / A. Girlando; M. Masino; S. Kaiser; Y. Sun; N. Drichko; M. Dressel; H. Mori. - In: PHYSICA STATUS SOLIDI. B, BASIC RESEARCH. - ISSN 1521-3951. - 249(2012), pp. 953-956. [10.1002/pssb.201100722]
|Tipologia ministeriale:||Articolo su rivista|
|Appare nelle tipologie:||1.1 Articolo su rivista|