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

Bálint Náfrádi, Areta Olariu, László Forró, Cécile Mézière, Patrick Batail, András Jánossy

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15 Citations (Scopus)

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 ) 2 X (X= AsF 6 ,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 J AsF6 =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.

Original languageEnglish
Article number224438
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number22
DOIs
Publication statusPublished - Jun 29 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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