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- W2008734895 abstract "Abstract The rare-earth hydrogen systems present phase diagrams with rather extended solid solution (α-RH x ) and dihydride (β-RH 2+ x ) regions, leading eventually – for high-enough concentrations and low-enough temperatures – to ordering interactions between the x -hydrogens. In the case of magnetic rare earths, this gives rise to a multitude of fascinating phenomena caused by the competition between magnetic anisotropy and RKKY interactions on the one hand and the hydrogen sublattice (via the crystal field) on the other. Thus, the peculiar quasi-unidimensional chains of H–H pairs formed along the c -axis in the α-phase of some of the HCP rare earths (α ∗ -RH x ) affect different types of magnetic ordering in very different ways. This is demonstrated through the interactions with the conical ferromagnetism of Er on the one hand and the c -axis-oriented 3-4 ferrimagnetism of Tm on the other, as well as with their c -axis-modulated sinusoidal magnetism. A possible interpretation of the H–H chain configuration through a charge-density-wave mechanism is suggested from recent experiments on hydrogen interaction with the helical magnetism in the Y y Tb 1− y H x alloy system. In the case of the β-RH 2+ x phase, the excess x -hydrogens occupying the octahedral sites of the CaF 2 -type dihydride lattice often order in a tetragonal sublattice of DO 22 symmetry corresponding to an RH 2.25 stoichiometry. This strongly modifies the various commensurate and incommensurate magnetic structures present, sometimes leading to their complete vanishing or to the appearance of short-range order. Examples using neutron scattering and resistivity data from the systems RH(D) 2+ x , with R=Ce, Tb, and Ho, shall be given as illustration. Finally, recent preliminary results from Los Alamos show that the cubic actinide hydrides AH 2+ x (A=Np, Pu, Am) exhibit very similar ordering phenomena, opening the door to large possibilities for magneto-structural interactions within the group of 5f-metals." @default.
- W2008734895 created "2016-06-24" @default.
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- W2008734895 date "2000-08-01" @default.
- W2008734895 modified "2023-09-27" @default.
- W2008734895 title "Hydrogen ordering and magnetic phenomena in (mostly rare-earth based) metal–hydrogen systems: highlights and open problems" @default.
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- W2008734895 doi "https://doi.org/10.1016/s0921-4526(00)00430-0" @default.
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