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Optical studies of κ-(ET) 2 Cu[ N(CN) 2 ] Br 0.85 Cl 0.15

Abstract : The low-temperature ground states of the quasi two-dimensional layered organic charge transfer salts kappa-(ET) 2Cu[ N(CN) 2] Br 1-xCl x are known to be strongly dependent on the Br/Cl content of the anions. At low temperatures, pure Cl compounds undergo a phase transition into an antiferromagnetic ground state while the pure Br compound is a organic superconductor. Here we present polarized infrared reflectivity measurements on the compound with 85% bromine and 15% chlorine. Our measurements were performed within the highly conducting a-c plane. From room temperature down to 90 K, we observe the typical signatures of a semiconductor in our spectra. When the sample is cooled down further, a significant amount of spectral weight is shifted towards lower frequencies. At 6 K, a Drude-like optical conductivity is observed in the far infrared.
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https://hal.univ-angers.fr/hal-02542500
Contributeur : Cécile Meziere <>
Soumis le : mardi 14 avril 2020 - 16:45:50
Dernière modification le : dimanche 19 avril 2020 - 10:58:03

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J. Barz, M. Dumm, M. Dressel, C. Meziere, P. Batail. Optical studies of κ-(ET) 2 Cu[ N(CN) 2 ] Br 0.85 Cl 0.15. Journal de Physique 4, EDP Sciences, 2004, 114, pp.289-290. ⟨10.1051/jp4:2004114061⟩. ⟨hal-02542500⟩

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