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Infrared spectra of the one-dimensional quarter-filled Wigner lattice compounds delta-(EDT-TTF-CONMe2)(2)X (X = AsF6, Br): Domain-wall excitations

Abstract :

Optical investigations of quarter-filled charge ordered insulators delta-(EDT-TTF-CONMe2)(2)X, X = AsF6, Br are reported. The spectra evidence the one-dimensional nature of the systems at all temperatures. The charge order exists already at room temperature, the optical gap is estimated to be of the order of 550 cm(-1) for the X = Br compound and about 700 cm(-1) for the X = AsF6 material. The optical response in the direction of the stacks is discussed in terms of domain-wall excitations of one-dimensional quarter-filled Wigner lattice at moderate values of nearest-neighbor electronic repulsion. A similarity between the effects of temperature contraction and chemical pressure is found.

Keywords : organic conductors
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https://hal.univ-angers.fr/hal-03344531
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Soumis le : mercredi 15 septembre 2021 - 10:10:36
Dernière modification le : jeudi 9 décembre 2021 - 15:46:06

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Ágnes Antal, T. Knoblauch, Martin Dressel, Patrick Batail, Natalia Drichko. Infrared spectra of the one-dimensional quarter-filled Wigner lattice compounds delta-(EDT-TTF-CONMe2)(2)X (X = AsF6, Br): Domain-wall excitations. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2013, 87 (7), Non spécifié. ⟨10.1103/PhysRevB.87.075118⟩. ⟨hal-03344531⟩

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