Bandwidth tuning triggers interplay of charge order and superconductivity in two-dimensional organic materials

We observe charge-order fluctuations in the quasi-two-dimensional organic superconductor β''-(BEDT-TTF)2SF5CH2CF2SO3, both by means of vibrational spectroscopy, locally probing the fluctuating charge order, and by investigating the in-plane dynamical response by infrared reflectance spectr...

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Published inPhysical review letters Vol. 105; no. 20; p. 206402
Main Authors Kaiser, S, Dressel, M, Sun, Y, Greco, A, Schlueter, J A, Gard, G L, Drichko, N
Format Journal Article
LanguageEnglish
Published United States 09.11.2010
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Summary:We observe charge-order fluctuations in the quasi-two-dimensional organic superconductor β''-(BEDT-TTF)2SF5CH2CF2SO3, both by means of vibrational spectroscopy, locally probing the fluctuating charge order, and by investigating the in-plane dynamical response by infrared reflectance spectroscopy. The decrease of the effective electronic interaction in an isostructural metal suppresses both charge-order fluctuations and superconductivity, pointing to their interplay. We compare the results of our experiments with calculations on the extended Hubbard model.
ISSN:1079-7114
DOI:10.1103/physrevlett.105.206402