Static and dynamic properties of the quasi-1D Heisenberg antiferromagnets AgVP2S6 (S=1) and AgCrP2S6 (S = 3/2)

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Abstract

Differences in behaviour between the two quasi-1D Heisenberg antiferromagnets AgVP2S6 (S=1) and AgCrP2S6 (S = 3/2) have been evidenced by susceptibility measurements, neutron powder diffraction and inelastic neutron scattering. The results obtained for the S=1 compound are consistent with Haldane's conjecture as well as existing numerical results. The S = 3/2 compound behaves conventionally above the 3D ordering temperature (TN=20 K).

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    Citation Excerpt :

    Contrary to the conclusions of Matsushita and Ueda [3], we have shown that the irregularity of susceptibility at 5 K is clearly due to a 3D long-range magnetic ordering of the iron magnetic moments of jamesonite. For AgVP2S6 (S=1) [7] and MnCl3(bipy) (S=2) [8] no long-range magnetic ordering could be detected; on the other hand, like jamesonite, CsNiCl3 (S=1) [9] and CrCl2 (S=2) [10] show 3D ordering at low temperature. Jamesonite is a canted antiferromagnet.

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