EPR Study of the Quasi One-Dimensional Alternating Antiferromagnet CsFeS2

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  • Matsuda Yuji
    Institute for Solid State Physics, the University of Tokyo
  • Ito Yuji
    Institute for Solid State Physics, the University of Tokyo
  • Nishi Masakazu
    Institute for Solid State Physics, the University of Tokyo

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  • EPR Study of the Quasi One-Dimensional Alternating Antiferromagnet CsFeS<SUB>2</SUB>
  • EPR Study of the Quasi One Dimensional

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EPR line widths and the resonance field of CsFeS2, the quasi one-dimensional alternating antiferromagnet, are measured as a function of the angle between the chain axis and the external applied field, and of the temperature over the range of 100 K and 500 K. The line widths are much broader than those of the similar compounds like KFeS2, which is the usual quasi one-dimensional antiferromagnet; and the relaxation mechanism responsible for the extra line width is attributed to the singlet ground state of the alternating chain system.<BR>Although the observed angular and temperature dependence of the line width could well be explained by the short time spin correlation due to the intra-chain exchange interaction; for the shift of the resonance field towards the higher field side irrespective of the applied field direction as temperature is lowered, no satisfactory explanation was found.

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