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, A. Jánossy

Research output: Contribution to journalArticle

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

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Spin dynamics
spin dynamics
Paramagnetic resonance
electron paramagnetic resonance
temperature dependence
insulators
magnetic permeability
Temperature
anisotropy
shift
estimates
Linewidth
Anisotropy
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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. / Náfrádi, Bálint; Olariu, Areta; Forró, László; Mézière, Cécile; Batail, Patrick; Jánossy, A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 22, 224438, 29.06.2010.

Research output: Contribution to journalArticle

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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.",
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AU - Náfrádi, Bálint

AU - Olariu, Areta

AU - Forró, László

AU - Mézière, Cécile

AU - Batail, Patrick

AU - Jánossy, A.

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N2 - 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.

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