Magnetic Critical Scattering from an Itinerant Antiferromagnet of γFe_<0.5>Mn_<0.5> Alloy : I. Quasi Elastic Scattering

概要

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The magnetic critical scattering from a single crystal of γ-Fe_<0.537>Mn_<0.463> has been studied around the (001) and (110) reciprocal lattice points. It has been found that the longitudinal spin correlation becomes divergent at the Neel temperature T_N of 479.0±1.5 K, the parallel staggered susceptibility x_<⫽>(Q) obeys a power law of α(T-T_N)^<-1.35±0.05>, in contrast with the temperature independent static susceptibility. The transverse spin correlation, however, remains finite at T_N with the inverse correlation length of about 0.038Å^<-1>. The anisotropy of the spin correlation has been suggested not due to the crystal anisotropy, but to either the anisotropic exchange interaction or the anisotropy of the non-interacting spin susceptibility of d bands. The anisotropy of the scattering profile with respect to the wave vector around the reciprocal lattice points has been found much smaller than that expected for the type I antiferromagnet with the short range interactions.
社団法人日本物理学会の論文
1973-12-05