The work was supported by the DFG. N. D. acknowledges support from the Margarethe von Wrangell program. Work at Argonne National Laboratory is sponsored by U.S. DOE Contract No. DE-AC02-06CH11357. Work at Portland State was supported by the NSF (Che-9904316).
Physical Review Letters
Organic superconductors, Reflectance spectroscopy, Superconductivity
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.
Kaiser, S., Dressel, M., Sun, Y., Greco, A., Schlueter, J., Gard, G., & Drichko, N. (2010). Bandwidth tuning triggers interplay of charge order and superconductivity in two-dimensional organic materials. Physical Review Letters, 105(20), 206402.