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Spin dynamics in the S=1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br): A multifrequency electron spin resonance study

Abstract :

We present a multifrequency electron spin resonance study in the range of 4–420 GHz of the quasi-one-dimensional, nondimerized, quarter-filled Mott insulators, δ-(EDT-TTF-CONMe2)2X (X=AsF6,Br). In the high-temperature orthorhombic phase above T∼190 K, the magnitude and the temperature dependence of the high-temperature spin susceptibility are described by a S=1/2 Heisenberg antiferromagnetic chain with JAsF6=298 K and JBr=474 K coupling constants for X=AsF6 and Br, respectively. We estimate from the temperature dependence of the linewidth (ΔH) an exchange anisotropy, J′/J of ∼2×10−3. The frequency dependence of ΔH and the g shift have an unusual quadratic dependence in all crystallographic orientations that we attribute to an antisymmetric exchange (Dzyaloshinskii-Moriya) interaction.

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https://hal.univ-angers.fr/hal-03343367
Contributeur : Okina Université d'Angers <>
Soumis le : mardi 14 septembre 2021 - 10:29:45
Dernière modification le : mercredi 15 septembre 2021 - 03:27:15

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Bálint Náfrádi, Areta Olariu, László Forró, Cécile Mézière, Patrick Batail, et al.. Spin dynamics in the S=1/2 antiferromagnetic chain compounds delta-(EDT-TTF-CONMe2)(2)X (X=AsF6, Br): A multifrequency electron spin resonance study. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2010, 81 (22), Non spécifié. ⟨10.1103/PhysRevB.81.224438⟩. ⟨hal-03343367⟩

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