Magnetism and electronic structures of hexagonal 1:1:1 rare earth-based intermetallic compounds (original) (raw)
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The description of basic experiments of the rare-earth hard magnetic materials, high-field magnetization curves on single-crystalline samples of Ho 2 Co 17 and Nd 2 Fe 14 B is reviewed with the aim to derive parameters physically relevant on atomic scale. The anisotropic magnetic properties have been found to be of single-ion origin. The successful description of the rare-earth compounds Ho 2 Co 17 , Nd in terms of the crystal-field, spin–orbit and inter-site magnetic interactions proves the existence, in a solid, the discrete atomic-like low-energy electron structure that predominantly governs the magnetic and electronic properties. The macroscopic properties have been correlated with the atomic-scale parameters. These studies reveal the importance of the low-symmetry crystal-field interactions (high-order charge multipolar interactions) in description of the magnetic properties of 4f compounds. r
Magnetic properties of anomalous rare-earth intermetallic compounds
Physica B+C, 1985
In order to describe 4mie magnetic propxties of anomalous rare-earth co~iipoi~~idc and especi-all\ neutron diffraction. WC present here IWC~ relevant theoretical models: firstI>. the model describing Kondo and crystalline field effect\ within the effective resonant scattering Hamiltonian and the the spin fluctuation model. 'l'hc lirst model can five a good description of rn;ln~~ properties of cerium "Kondo compomids" ;I(sufficiently high temperature\ and we present here a calculation of the neutron ditfractioll spectrum and an extension at low temperature\. On the contrary. the spin fluctuation model is more appropriate for intermediate valence conipounds or also for Kondo compounds at verv 1~
Magnetic properties of some equiatomic ternary rare-earth compounds
Physical Review B, 1995
We have studied CePbCu, CeZnIn, and YbZnIn using heat-capacity (3-25 K), electrical-resistivity (1.4-300 K), and magnetic-susceptibility (2-300 K) measurements. For the sake of comparison, some measurements were also made on LaPbCu and GdPbCu. CePbCu orders antiferromagnetically at 8.3 K while magnetic ordering below 3 K is indicated in CeZnIn. Contrary to an earlier report in the literature, we find that YbPbCu does not exist and that the crystal structure of YbZnIn, in which the Yb ions are in the divalent state, is of the CeCu2 type, not the CaIn& type.
3d Magnetism in rare earth intermetallics
Journal of Magnetism and Magnetic Materials, 1990
A brief survey of lanthanide transition metal magnetism is presented. The paper then reviews work currently in progress on the Laves phase compounds (Re)Mn, where (Re) is a lanthanide element. Bulk measurements suggest a critical Mn-Mn separation for the stability of the manganese moment. Furthermore, the appearance of an ordered antiferromagnetic state is normally accompanied by a large first-order volume change, the volume change being attributed to the stability of the manganese moment. Analysis of thermal expansion data has led to the conclusion that longitudinal spin fluctuations characterise the paramagnetic state. Support for this interpretation has been provided by polarised neutron scattering experiments.
J. Alloys Compd. 367(1-2) pp. 255-261 (2004)
Starting with the Nd3(Fe,Ti)29 stoichiometry [Tb3(Fe1-xCox)27.4V1.6 and Dy3(Fe1-xCox)27.8V1.2; x= 0.6, 0.8, 1.0] two novel series of R-Fe-Co-V intermetallic compounds with a disordered variant of the hexagonal Th2Ni17-type structure were formed. The cell parameters decrease and the Curie temperature increases with increasing Co content. XRD patterns of magnetically aligned powder samples revealed the presence of planar magnetic anisotropy. Keywords: R-TM intermetallics (A); Magnetically ordered materials (A); Powder metallurgy (B); X-ray and γ-ray spectroscopy (D); Magnetic measurements (D)
Intrinsic magnetic properties of new rare-earth iron intermetallic series
Journal of Magnetism and Magnetic Materials, 1991
New rare-earth iron intermetallic compounds have been generated from existing series by the reaction of powder with an appropriate gas at about 500 ° C. Interstitial atoms occupy sites adjacent to the rare earth, thereby creating a crystal field that reflects the new local symmetry. They also expand the lattice, which greatly modifies the Fe-Fe exchange interactions and may increase the iron moment by narrowing the 3d bands. These effects are discussed with reference to three systems: R2FeI7N3 ~, R2Fe17C3_ a and R(FeI1Ti)N l ~. Increases of Curie temperature of 300-400 K are achieved on nitrogenation or carbonation of R2Fej7, whereas the increases in the 1 : 12 compounds are approximately 200 K. The sign of A°2, the second-order crystal-field coefficient at rare-earth sites, is opposite in the 2 : 17 and 1 : 12 interstitial compounds.
Crystalline-electric-field effect in some rare-earth intermetallic compounds
Physica B: Condensed Matter, 2002
The results of research on the crystalline-electric-field (CEF) effect in RCu 2 , R 2 Fe 14 B and RFe 11 Ti compounds are presented. In the study of the CEF effect in the RCu 2 compounds, attention is paid to the combined analysis of specific heat and thermal expansion. An attempt has been undertaken to investigate the systematic behavior of CEF interactions by comparing different compounds with the same crystallographic structure. From the analysis of spinreorientation phenomena in R 2 Fe 14 B and RFe 11 Ti compounds the sets of CEF parameters are derived. r