Phase transitions and rare-earth magnetism in hexagonal and orthorhombic DyMnO${}_3$ single crystals

Abstract

The floating-zone method with different growth ambiances has been used to selectively obtain hexagonal or orthorhombic DyMnO${}_3$ single crystals. The crystals were characterized by X-ray powder diffraction of ground specimen and a structure refinement as well as electron diffraction. We report magnetic susceptibility, magnetisation, and specific heat studies of this multiferroic compound in both the hexagonal and the orthorhombic structure. The hexagonal DyMnO${}_3$ shows magnetic ordering of Mn${}^{3+}$ (S =2) spins on a triangular Mn lattice at $T_N^{\mathrm{Mn}}$ = 57 K characterized by a cusp in the specific heat. This transition is not apparent in the magnetic susceptibility due to the frustration on the Mn triangular lattice and the dominating paramagnetic susceptibility of the Dy${}^{3+}$ (S=9/2) spins. At $T_N^{\mathrm{Dy}}$ = 3 K, a partial antiferromagnetic order of Dy moments has been observed. In comparison, the magnetic data for orthorhombic DyMnO${}_3$ display three transitions. The data broadly agree with results from earlier neutron diffraction experiments, which allows for the following assignment: a transition from an incommensurate antiferromagnetic ordering of Mn${}^{3+}$ spins at $T_N^{\mathrm{Mn}}$ = 39 K, a {\textit{lock--in}} transition at $T_{\mathrm{lock}-\mathrm{in}}$ = 16 K and a second antiferromagnetic transition at $T_N^{\mathrm{Dy}}$ = 5 K due to the ordering of Dy moments. Both the hexagonal and the orthorhombic crystals show magnetic anisotropy and complex magnetic properties due to 4$f-4f$ and 4$f-3d$ couplings.

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• Epitaxy of hexagonal ABO${}_3$ quantum materials
• Incompatible Magnetic Order in Multiferroic Hexagonal DyMnO3
• Magnetic Order of the Hexagonal Rare Earth Manganite Dy(0.5)Y(0.5)MnO3
• Anisotropic signatures in the spin-boson model
• Nature of Structural Changes Near the Magnetic Ordering Temperature in Small-Ion Rare Earth Perovskites RMnO3
• Surface Reconstruction of Hexagonal Y-doped HoMnO3 and LuMnO3 studied using low-energy electron diffraction