Critical behavior in the Ising antiferromagnet MnTe2.

摘要: Symmetry considerations indicate that although ${\mathrm{MnTe}}_{2}$ has cubic symmetry, the antiferromagnetic transition in this compound is Ising-like. Critical properties of have been studied reduced temperature range 5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$\ensuremath{\le}\ensuremath{\Vert}t\ensuremath{\Vert}=\ensuremath{\Vert}(T-${T}_{N}$)/${T}_{N}$\ensuremath{\Vert} \ensuremath{\le}1\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}1}$ by neutron scattering techniques. It found critical exponent \ensuremath{\beta}=0.431\ifmmode\pm\else\textpm\fi{}0.009 anomalously large, while value \ensuremath{\nu}=0.635\ifmmode\pm\else\textpm\fi{}0.014 reasonable agreement with expected theoretical estimates. The exponents can be reconciled values application corrections to scaling. However, size some and increased uncertainties produced introduction additional fitting parameters, make it difficult sure analysis justified.