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Wednesday, October 21, 2015
3:00 PM - 4:00 PM
MPA-CMMS Conference Room, TA-3, Bldg 32, Rm 134

CMS Colloquium

Charge Fluctuations and Superconductivity in Organic Conductors: the case of 𝛽′′-(ET)2SF5CH2CF2SO3

Stuart Brown
UCLA

Superconductivity in most organic charge transfer salts is considered magnetically mediated, in part because of the proximity of the superconductivity to antiferromagnetic ground states as well as the preponderance of spin fluctuations in the normal state of the superconducting compounds. An alternative proposal is based on mediation by charge fluctuations. The idea follows from the observation that poorly screened near-neighbor Coulomb repulsions V are sufficiently strong in some cases to produce charge-ordered insulating states. In tuning the relative amplitude of V smaller, the charge-ordered state would collapse. The proposal that superconductivity emerges from the leftover fluctuations is examined in the context of the normal state and superconducting properties of the all-organic salt, 𝛽′′-(ET)2X, with X = SF5CH2CF2SO3 .

Host: Eric Bauer