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- W2078017282 abstract "The floating-zone method with different growth ambiences has been used to selectively obtain hexagonal or orthorhombic DyMnO3 single crystals. The crystals were characterized by x-ray powder diffraction of ground specimens and a structure refinement as well as electron diffraction. We report magnetic susceptibility, magnetization and specific heat studies of this multiferroic compound in both the hexagonal and the orthorhombic structure. The hexagonal DyMnO3 shows magnetic ordering of Mn3+ (S = 2) spins on a triangular Mn lattice at TNMn = 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 Dy3+ (S = 9/2) spins. At TNDy = 3 K, a partial antiferromagnetic order of Dy moments has been observed. In comparison, the magnetic data for orthorhombic DyMnO3 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 Mn3+ spins at TNMn = 39 K, a lock-in transition at Tlock−in = 16 K and a second antiferromagnetic transition at TNDy = 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 4f–4f and 4f–3d couplings." @default.
- W2078017282 created "2016-06-24" @default.
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- W2078017282 date "2009-02-09" @default.
- W2078017282 modified "2023-10-14" @default.
- W2078017282 title "Phase transitions and rare-earth magnetism in hexagonal and orthorhombic DyMnO<sub>3</sub>single crystals" @default.
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- W2078017282 doi "https://doi.org/10.1088/0953-8984/21/9/096002" @default.
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