混晶 Fe₁-xCoxCl₂・2H₂OのOblique反強磁性相におけるスピン構造

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  • Spin Structure at Oblique Antiferromagnetic phase of the Random Mixture Fe₁-xCoxCl₂・2H₂O
  • コンショウ Fe1-xCoxCl2 2H2O ノ Oblique ハン キョウ
  • コンショウ Fe₁-xCoxCl₂・2H₂O ノ Oblique ハン キョウジセイショウ ニオケル スピン コウゾウ

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Proton NMR spectra of random mixture Fe₁-xCoxCl₂・2H₂O with competing anisotropies sharply depend on the Co concentration x. The line shape at high Co concentration region is very sharp and symmetric with peak frequency of about 18MHz. With decreasing x, still at Co-type antiferromagnetic (AF) phase, the line shape becomes broad and asymmetric to lower frquencies. With decreasing x, in oblique antiferromagnetic (OAF) phase the line shape expands to both low and high frequency sides. In Fe-rich region at OAF phase, the another lower spectre appeares with peak frequency of about 9.5~ 11.0MHz. This lower spectra are observed even at Fe-type AF phase. These results suggest that at Co-type AF phase both Fe and Co spins order along the b-axis in Co-rich concentration region, and only some part of Fe spins tilt from the b-axis near boundary concentration region. In the OAF phase, both a-, andbcomponents order independently, some part of both Fe and Co spins tilt with more larger magnetic moments than that in the usual antiferromagnets. In Fe- or Co-rich concentration at OAF phase, the another spins order almost parallel to the each easy axis of Fe- or Co-type AF.

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