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- W2089044692 abstract "Nuclear-magnetic-resonance measurements are performed on $^{19}mathrm{F}$ nuclei in the weakly anisotropic planar antiferromagnet ${mathrm{K}}_{2}$Mn${mathrm{F}}_{4}$ over the temperature range 4-300 K, which includes the transition temperature ${T}_{N}=41.5$ K. The linewidth contributions due to longitudinal and transverse magnetic fluctuations have been analyzed in detail and compared to the numerical calculations performed for the two-dimensional (2-D) and three-dimensional (3-D) Ising models, and the 3-D Heisenberg model. When ${T}_{N}$ is approached from above, the longitudinal contribution to the linewidth of the axial fluorine nuclei diverges critically, in agreement with the 2-D Ising model predictions [$w=2ensuremath{nu}(1ensuremath{-}ensuremath{eta})=1.5$]. Conversely, the linewidth of the planar fluorine nuclei, which remains finite as $Tensuremath{rightarrow}{T}_{N}$, does not exhibit a complete anisotropy in the longitudinal and transverse components, except for a very narrow region of temperatures close to ${T}_{N}$. The dramatic influence that the small anisotropy term in the Hamiltonian has on the $stackrel{^}{q}ensuremath{sim}0$ fluctuations (essentially sensed by the axial $^{19}mathrm{F}$ nuclei), in contrast to the weak influence on the $stackrel{^}{q}ensuremath{sim}frac{ensuremath{pi}}{a}$ fluctuations (sensed by the planar $^{19}mathrm{F}$ nuclei), is discussed in terms of the dipolar nature of the anisotropy. Arguments are given to justify the $T$ dependence of the planar $^{19}mathrm{F}$ linewidth, which is not satisfactorily described by the current models." @default.
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- W2089044692 date "1974-04-01" @default.
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- W2089044692 title "Magnetic phase transition in planar antiferromagnets:F19magnetic-resonance experiments inK2MnF4" @default.
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- W2089044692 doi "https://doi.org/10.1103/physrevb.9.3053" @default.
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