The first direct experimental evidence to suggest the Fermi surface (FS) as being responsible for driving the helical antiferromagnetic ordering in a gadolinium-yttrium alloy is reported. The presence of a FS sheet capable of nesting is revealed, and the nesting vector associated with the sheet is found to be in excellent agreement with the periodicity of the helical ordering.
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Fretwell et al. (1999) studied this question.
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