Fermi Surface as the Driving Mechanism for Helical Antiferromagnetic Ordering in Gd-Y Alloys
H. M. Fretwell, S. B. Dugdale, M. A. Alam, D. C. R. Hedley, A. Rodriguez-Gonzalez, S. B. Palmer
Abstract
The first direct experimental evidence for the Fermi surface (FS) 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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