title: Bandwidth tuning triggers interplay of charge order and superconductivity in two-dimensional organic materials.
abstract: 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.
authors.affiliation: Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Kaiser
authors.forename: M
authors.initials: M
authors.lastname: Dressel
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.forename: A
authors.initials: A
authors.lastname: Greco
authors.forename: J A
authors.initials: JA
authors.lastname: Schlueter
authors.forename: G L
authors.initials: GL
authors.lastname: Gard
authors.forename: N
authors.initials: N
authors.lastname: Drichko