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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 paper, the crystal and magnetic structures of the BaFe12−xAlxO19 (x = 0.1−1.2) solid solutions have been investigated with powder neutron diffractometry.
Abstract: The investigations of the crystal and magnetic structures of the BaFe12−xAlxO19 (x = 0.1–1.2) solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the BaFe12−xAlxO19 (x = 0.1–1.2) solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields. The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range (from 4.2 K to 150 K). It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the BaFe12−xAlxO19 (x = 0.1–1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed.
95 citations
TL;DR: In this paper, the atom positions in antiferromagnetic and ferroelectric BiFeO3 have been obtained by profile analysis of powder neutron diffraction data collected ant 42K and 293K.
Abstract: The atom positions in antiferromagnetic and ferroelectric BiFeO3 have been obtained by profile analysis of powder neutron diffraction data collected ant 42K and 293K The sublattice magnetization also determined at 42K, has been used to obtain a covalency parameter sum, Asigma 2+2Api 2+As2=134+or-05% An experiment to obtain further information about the neutron magnetic form factor, by complete separation of the nuclear and magnetic contributions using polarization analysis, is described
95 citations
TL;DR: In this article, the authors used neutron diffraction to definitively establish the nature of the phase transition at and the magnetic structure adopted below this temperature, and the 4-k and 1-k variants of the antiferromagnet Gd2Ti2O7 were distinguished by analysis of the diffuse scattering, which represents a new method of solving the'multi-k' problem of magnetic structure determination.
Abstract: The geometrically frustrated antiferromagnet Gd2Ti2O7 exhibits magnetic behaviour of such complexity that it poses a challenge to both experiment and theory. Magnetic ordering commences at TN = 1.1 K and there is a further magnetic phase transition at K. Here we use neutron diffraction to definitively establish the nature of the phase transition at and the magnetic structure adopted below this temperature. Between and TN the structure is partly ordered, as previously reported. Below the remaining spins order, but only weakly. The magnetic structure in this temperature range is shown to be a 4-k structure, closely related to the 1-k structure previously suggested. The 4-k and 1-k variants of the structure are distinguished by analysis of the diffuse scattering, which we believe represents a new method of solving the 'multi-k' problem of magnetic structure determination.
94 citations
TL;DR: The magnetic phase diagram of La 2-2 x Sr 1+2 x Mn 2 O 7 (0.30 ≤ x ≤ 0.50) was reexamined from the point of view of the crystal structure, particularly the Jahn-Teller (JT) distortion Δ J T of Mn-O 6 octahedra, i.e., the ratio of the averaged apical MnO bond length to the equatorial Mn O bond length as discussed by the authors.
Abstract: The magnetic phase diagram of La 2-2 x Sr 1+2 x Mn 2 O 7 (0.30 ≤ x ≤ 0.50) was reexamined from the point of view of the crystal structure, particularly the Jahn-Teller (JT) distortion Δ J T of Mn-O 6 octahedra, i.e., the ratio of the averaged apical Mn-O bond length to the equatorial Mn-O bond length. We have found that Δ J T decreases with increasing hole concentration x , while the canting angle between neighboring planes continuously increases from 0° (planar ferromagnet: 0.32 ≤ x ≤0.38) to 180° (A-type antiferromagnet (AFM): x =0.48). The dominance of the A-type AFM structure with the decrease of Δ J T can be ascribed to the change in the e g orbital state from d 3 z 2 - r 2 to d x 2 - y 2 .
94 citations
TL;DR: In this paper, a detailed examination of the magnetic structure of anhydrous cupric chloride was carried out by powder neutron diffraction, magnetic susceptibility, and specific heat measurements on polycrystalline and single-crystal samples as well as an evaluation of the spin-exchange interactions by first-principles density-functional theory (DFT) calculations.
Abstract: We report a detailed examination of the magnetic structure of anhydrous cupric chloride ${\text{CuCl}}_{2}$ carried out by powder neutron diffraction, magnetic susceptibility, and specific heat measurements on polycrystalline and single-crystal samples as well as an evaluation of the spin-exchange interactions by first-principles density-functional theory (DFT) calculations. Anhydrous ${\text{CuCl}}_{2}$ shows one-dimensional antiferromagnetic behavior and long-range antiferromagnetic ordering below a N\'eel temperature of 23.9 K. Neutron powder and single-crystal diffraction reveal that, below 23.9 K, ${\text{CuCl}}_{2}$ undergoes a phase transition into an incommensurate magnetic structure [propagation vector (1,0.2257,0.5) with a spin spiral propagating along $b$ and the moments confined in the $bc$ crystallographic plane]. Our DFT calculations show that the spin spiral results from competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor spin-exchange interactions along the spin chains. Implications for possible multiferroic behavior of ${\text{CuCl}}_{2}$ are discussed.
93 citations