Different electronic transport regimes in the quasi-two-dimensional organic conductors κ-(BEDT-TTF)2 X
| Autor: | Jens Brandenburg, Jens Müller, Dieter Schweitzer, John A. Schlueter |
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| Rok vydání: | 2012 |
| Předmět: |
Condensed matter physics
Chemistry Charge (physics) Electron Condensed Matter Physics Coupling (probability) Electronic Optical and Magnetic Materials Metal Delocalized electron visual_art visual_art.visual_art_medium Condensed Matter::Strongly Correlated Electrons Charge carrier Spectroscopy Noise (radio) |
| Zdroj: | physica status solidi (b). 249:957-961 |
| ISSN: | 0370-1972 |
| Popis: | We study the low-frequency dynamical properties of correlated charge carriers in various of the quasi-two-dimensional organic charge-transfer salts {kappa}-(BEDT-TTF){sub 2}X by means of fluctuation (noise) spectroscopy. Close to the critical endpoint of the Mott metal-insulator transition, a pronounced increase of the 1/f-noise level accompanied by a substantial shift of spectral weight to low frequencies indicates a sudden increase of the time scale of the charge fluctuations. For the less correlated, more 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. |
| Databáze: | OpenAIRE |
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