Bandwidth Tuning Triggers Interplay of Charge Order and Superconductivity in Two-Dimensional Organic Materials

S. KAISER,1 M. DRESSEL,1 Y. SUN, A. GRECO ,2 J. A. SCHLUETER,3 G. L. GARD,4 AND N. DRICHKO

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2010 vol. 105 p. 2064021 - 2064024

0031-9007

We observe charge-order fluctuations in the quasi-two-dimensional organic superconductor
00
ðBEDT
TTFÞ2SF5CH2CF2SO3, both by means of vibrational spectroscopy, locally probing the fluctuatingcharge order, and by investigating the in-plane dynamical response by infrared reflectancespectroscopy. The decrease of the effective electronic interaction in an isostructural metal suppressesboth charge-order fluctuations and superconductivity, pointing to their interplay. We compare the resultsof our experiments with calculations on the extended Hubbard model.