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Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]BrxCl1-x: Optical studies of correlated carriers.

Abstract :

In the two-dimensional organic charge-transfer salts κ-(BEDT-TTF)2Cu[N(CN)2]BrxCl1−x a systematic variation in the Br content from x=0 to 0.9 allows us to tune the Mott transition by increasing the bandwidth. At temperatures below 50 K, an energy gap develops in the Cl-rich samples and grows to approximately 1000 cm−1 for T→0. With increasing Br concentration spectral weight shifts into the gap region and eventually fills it up completely. As the samples with x=0.73, 0.85, and 0.9 become metallic at low temperatures, a Drude-type response develops due to the coherent quasiparticles. Here, the quasiparticle scattering rate shows a ω2 dependence and the effective mass of the carriers is enhanced in agreement with the predictions for a Fermi liquid. These typical signatures of strong electron-electron interactions are more pronounced for compositions close to the critical value xc≈0.7, where the metal-to-insulator transition occurs.

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https://hal.univ-angers.fr/hal-03343356
Contributeur : Okina Université d'Angers <>
Soumis le : mardi 14 septembre 2021 - 10:25:39
Dernière modification le : mercredi 15 septembre 2021 - 03:27:12

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Michael Dumm, Daniel Faltermeier, Natalia Drichko, Martin Dressel, Cécile Mézière, et al.. Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]BrxCl1-x: Optical studies of correlated carriers.. Physical Review B, 2009, 79 (19), Non spécifié. ⟨10.1103/PhysRevB.79.195106⟩. ⟨hal-03343356⟩

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