# Low-frequency charge-carrier dynamics in the vicinity of the Mott transition in quasi-two-dimensional organic superconductors $\\kappa$-(BEDT-TTF)${}\_{2}$X Source: [Low-frequency charge-carrier dynamics in the vicinity of the Mott transition in quasi-two-dimensional organic superconductors $\\kappa$-(BEDT-TTF)${}\_{2}$X]() Collection index: [llms.txt]() Data updated: 2025-10-24T17:03:09.360Z Authors: Jens Brandenburg, Jens M\\"uller, Dieter Schweitzer, John A. Schlueter Published: 2011-05-17T15:26:09.000Z ## Abstract We investigate the dynamics of correlated charge carriers in the vicinity of the Mott metal-to-insulator transition in various of the title quasi-two-dimensional organic charge-transfer salts by means of fluctuation (noise) spectroscopy. The observed $1/f$-type fluctuations are quantitatively very well described by a phenomenological model based on the concept of non-exponetial kinetics. The main result is a correlation-induced enhancement of the fluctuations accompanied by a substantial shift of spectral weight to low frequencies close to the Mott critical endpoint. This sudden slowing down of the electron dynamics may be a universal feature of metal-to-insulator transitons. For the less correlated metallic materials, we find a crossover/transition from hopping transport of more-or-less localized carriers at elevated temperatures to a low-temperature regime, where a metallic coupling of the layers allows for coherent interlayer transport of delocalized electrons. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()