Magnetic interactions in PdCrO${}_2$ and their effects on its magnetic structure

Abstract

We report a neutron scattering study of the metallic triangular lattice antiferromagnet PdCrO${}_2$. Powder neutron diffraction measurements confirm that the crystalline space group symmetry remains $R\bar{3}m$ below $T_N$. This implies that magnetic interactions consistent with the crystal symmetry do not stabilise the non-coplanar magnetic structure which was one of two structures previously proposed on the basis of single crystal neutron diffraction measurements. Inelastic neutron scattering measurements find two gaps at low energies which can be explained as arising from a dipolar-type exchange interaction. This symmetric anisotropic interaction also stabilises a magnetic structure very similar to the coplanar magnetic structure which was also suggested by the single crystal diffraction study. The higher energy magnon dispersion can be modelled by linear spin wave theory with exchange interactions up to sixth nearest-neighbors, but discrepancies remain which hint at additional effects unexplained by the linear theory.

arXiv comment10 pages, 5 figures, submitted to Phys. Rev. B

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• From basic properties to the Mott design of correlated delafossites
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• Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO2
• Avoided metallicity in a hole-doped Mott insulator on a triangular lattice
• Probing hidden Mott gap and incommensurate charge modulation on the polar surfaces of PdCrO${}_2$
• Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system
• $T-$linear resistivity from magneto-elastic scattering: application to PdCrO${}_2$
• Heisenberg spins on an anisotropic triangular lattice: PdCrO2 under uniaxial stress
• Electronic structure of monolayer-CrTe${}_2$: an antiferromagnetic 2D van der Waals material
• Control of Impurity Phase Segregation in a PdCrO${}_2$/CuCrO${}_2$ Heterostructure