Anisotropic Diffuse Scattering of Neutrons in Au-Cr Alloys

概要

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In gold-chromium alloys, the antiferromagnetic long range order fades into paramagnetic phase at chromium concentration of about 10 to 12 atomic percent. For specimens with the critical composition, anisotropic diffuse scattering of neutrons has been found around 100 reciprocal lattice point in temperatures between 10 to 170K. The antiferromagnetic reflection, 100, has broadened similar to the usual critical scattering for two specimens Au_<0.880>Cr_<0.120> and Au_<0.888>Cr_<0.112>. After analyzing by using the experimental resolution function, it was found that the half-width of the diffuse peak parallel to the propagation vector of the antiferromagnetic structure is roughly two times larger than that perpendicular to it. The reason of this diffuse scattering can be attributed to the anisotropy of the magnetic interaction between local moment of chromium via s-electrons, which is expected theoretically from the shape of the Fermi surface of gold.
社団法人日本物理学会の論文
1973-05-05