4.8 Article

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

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PHYSICAL REVIEW LETTERS
卷 105, 期 20, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.206402

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  1. DFG
  2. Margarethe von Wrangell program
  3. U.S. DOE [DE-AC02-06CH11357]
  4. NSF [Che-9904316]

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We observe charge-order fluctuations in the quasi-two-dimensional organic superconductor beta '' - (BEDT - TTF)(2)SF5CH2CF2SO3, 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.

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