Fermi Surface as the Driving Mechanism for Helical Antiferromagnetic Ordering in Gd-Y Alloys

TL;DR

This paper provides direct experimental evidence that Fermi surface nesting drives helical antiferromagnetic order in Gd-Y alloys, linking electronic structure to magnetic ordering.

Contribution

It is the first to experimentally demonstrate the Fermi surface's role in inducing helical antiferromagnetic order in Gd-Y alloys.

Findings

Identification of a nesting Fermi surface sheet

Nesting vector matches helical order periodicity

Experimental confirmation of Fermi surface influence

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.