Nature of the Antiferromagnetic Order in GdCu${}_2$

Abstract

A magnetic order in orthorhombic GdCu${}_2$ was investigated via a single crystal neutron diffraction with thermal neutron. Magnetic peaks were observed at incommensurate positions described by the ordering vector $q$=($\delta$,~1,~0) with $\delta$=0.678 at 4.6~K. This ordering vector is close to the commensurate one with $q_{\mathrm{c}}$=(2/3,~1,~0) reported earlier, but clearly deviates. The incommensurate nature of the magnetic order in GdCu${}_2$ is further corroborated by the peak shift with temperature below $T_{\mathrm{N}}$.

arXiv comment6 pages, 3 figures

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• Unique Helical Magnetic Order and Field-Induced Phase in Trillium Lattice Antiferromagnet EuPtSi