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 ${\beta }^{\prime \prime }$-(BEDT-TTF)2 SF5 CH2 CF2 SO3 both by means of vibrational spectroscopy, locally probing the fluctuating charge order, and investigating the in-plane dynamical response by infrared reflectance spectroscopy. The decrease of effective electronic interaction in an isostructural metal suppresses both charge-order fluctuations and superconductivity, pointing on their interplay. We compare the results of our experiments with calculations on the extended Hubbard model.

5 pages, 4 figures

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Cited by in corpus (20)

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• Superconductivity emerging from a stripe charge order in IrTe2 nanoflakes
• Charge ordering and non-local correlations in the doped extended Hubbard model
• Charge-order fluctuations and superconductivity in two-dimensional organic metals
• Displaced Drude peak and bad metal from the interaction with slow fluctuations
• Emergence of charge degrees of freedom under high pressure in an organic dimer-Mott insulator ${\beta }^{\prime }$-(BEDT-TTF)${}_2$ICl${}_2$
• 13C NMR study of superconductivity near charge instability realized in beta"-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2
• Collective excitation of a short-range charge ordering in $\theta$-$\mbox{(BEDT-TTF)}_2\mbox{CsZn(SCN)}_4$
• Charge Order Breaks Magnetic Symmetry in Molecular Quantum Spin Chains
• The metal-insulator transition in the organic conductor ${\beta }^{\prime \prime }$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Cl
• Microscopic coexistence of superconductivity and charge order in organic superconductor ${\beta }^{\prime \prime }$-(BEDT-TTF)${}_4$[(H${}_3$O)Ga(C${}_2$O${}_4$)${}_3$]$\cdot$C${}_6$H${}_5$NO${}_2$
• Charge imbalance in $\lambda$-(BETS)${}_2$GaCl${}_4$ and their interplay with superconductivity
• Charge fluctuations in the unconventional metallic state of Li0.9Mo6O17
• Dimer-Mott and charge-ordered insulating states in the quasi-one-dimensional organic conductors ${\delta }_P^{\prime }$- and ${\delta }_C^{\prime }$-(BPDT-TTF)${}_2$ICl${}_2$
• Charge-sensitive vibrational modes in the (EDT-TTF-OX)_2AsF_6 chiral molecular conductors
• Displaced Drude peak from $\pi$-ton vertex corrections
• Analytical expression for $\pi$-ton vertex contributions to the optical conductivity