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Magnetic structure
About: Magnetic structure is a research topic. Over the lifetime, 10787 publications have been published within this topic receiving 207143 citations.
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TL;DR: In this article, an S = 3/2 Heisenberg antiferromagnet on a triangular lattice of magnetic Cr atoms is studied by neutron powder diffraction, and it is shown that magnetic Bragg scattering is distributed on a line (1/31/3 zeta ), where zeta takes integer values.
Abstract: An S=3/2 Heisenberg antiferromagnet on a triangular lattice CuCrO2, in which stacking of the triangular lattice of magnetic Cr atoms forms a layered rhombohedral antiferromagnet, is studied by neutron powder diffraction. In the paramagnetic phase the powder diffraction pattern shows asymmetry, which proves a two-dimensional character. In the ordered phase, magnetic Bragg scattering has large width, indicating that the scattering is distributed on a line (1/31/3 zeta ) with peaks where zeta takes integer values. Although the magnetic long-range order is established in the c plane, correlation in the c direction is finite or the modulation vector is distributed on the line. Intensity of magnetic reflections is consistent with the 120 degrees structure in the a-c plane with moment (3.1+or-0.2) mu B.
115 citations
TL;DR: In this article, the authors investigated the magnetic structure in a polycrystalline sample of the B20-type MnGe by means of small-angle neutron scattering and found that a Debye-ring-like pattern appeared due to the random orientation of the spin helix q vectors (∥ ).
Abstract: We have investigated the magnetic structure in a polycrystalline sample of the B20-type MnGe by means of small-angle neutron scattering. On the projected diffraction plane normal to the incoming neutron beam, a Debye-ring-like pattern appears due to the random orientation of the spin helix q vectors (∥ ). When an external magnetic field is applied normal to the incoming neutron beam, an intense peak with wave vector (q) perpendicular to the applied magnetic field is observed as the hallmark of the formation of a skyrmion lattice with a multiple-q helix in a wide temperature-magnetic-field region. This scattering intensity remains even after removing the magnetic field, which indicates that a skyrmion lattice is stabilized as the ground state. A different form of skyrmion lattice, either square or cubic, is proposed, which is also shown to be in good agreement with previous high-angle neutron diffraction results. Calculations based on such structures also describe the magnetic-field profile of the topological Hall resistivity.
115 citations
TL;DR: In this paper, the electronic structures of magnetic orderings of Zn1?xTMxO (TM = Cu, Mn) have been studied with the B3LYP hybrid density functional.
Abstract: The electronic structures of magnetic orderings of Zn1?xTMxO (TM = Cu, Mn) have been studied with the B3LYP hybrid density functional. The corrections for energy band dispersions with respect to the local density approximation (LDA) are similar to GW results, but lead to an improved energy gap. Cu and Mn are close to +2 valence in Zn1?xTMxO (TM = Cu, Mn), but Cu1+ would be realized in n-type ZnO. Cu-?and Mn-doped ZnO have ferromagnetic and antiferromagnetic ground states, respectively. Magnetic couplings between transition metal ions depend sensitively on the interatomic distance.
115 citations
TL;DR: The measurements show the existence of two transitions to long-range ordered ferrimagnetic states, the first collinear and the second noncollinear, and taken together, the crystal and magnetic structures indicate a staggered ordering of the V d orbitals.
Abstract: Neutron inelastic scattering and diffraction techniques have been used to study the MnV2O4 spinel system. Our measurements show the existence of two transitions to long-range ordered ferrimagnetic states, the first collinear and the second noncollinear. The lower temperature transition, characterized by development of antiferromagnetic components in the basal plane, is accompanied by a tetragonal distortion and the appearance of a gap in the magnetic excitation spectrum. The low-temperature noncollinear magnetic structure has been definitively resolved. Taken together, the crystal and magnetic structures indicate a staggered ordering of the V d orbitals. The anisotropy gap is a consequence of unquenched V orbital angular momentum.
115 citations
TL;DR: In this article, the orthorhombic NdMnO3 perovskite has been studied on the basis of magnetization and neutron powder diffraction (NPD) data.
Abstract: The orthorhombic NdMnO3 perovskite (space group Pnma ) has been studied on the basis of magnetization and neutron powder diffraction (NPD) data. Magnetization measurements suggest the coexistence of ferromagnetic and antiferromagnetic interactions: magnetization versus magnetic field curves present a remnant magnetization in the ordered region, which is around 1 µB at T = 6 K. The thermal evolution of the magnetic structure has been followed down to 1.5 K from the NPD data. These measurements show that the Mn sub-lattice becomes ordered below T N 78 K with a spin arrangement (C x ,F y ,0), in such a way that a ferromagnetic component appears along the y -direction. The Nd sub-lattice becomes ordered below T 13 K according to a ferromagnetic arrangement with the moments parallel to the y -direction. At T = 1.5 K the magnetic moment values are 3.22(9) µB for Mn atoms and 1.2(2) µB for Nd atoms.
114 citations