Commensurate and incommensurate magnetic structures in rare-earth hydrides

被引:1
作者
Vajda, P [1 ]
Andre, G
机构
[1] Ecole Polytech, CNRS, CEA, Solides Irradies Lab, F-91128 Palaiseau, France
[2] CEA Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
关键词
rare-earth hydrides; magnetic anisotropy; RKKY interaction; commensurate and incommensurate structure;
D O I
10.1016/S0925-8388(01)01251-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The rare-earth-hydrogen systems possess phase diagrams with rather extended solid solution (alpha -RHx) and dihydride (beta -RH2+x) regions, leading eventually - for high enough concentrations and low enough temperatures - to ordering interactions between the x-hydrogens. In the case of magnetic Rs, 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 H-sublattice (via the crystal field), on the other. Thus, in the beta -RH2+x-phase, the excess x-hydrogens occupying the octahedral sites of the CaF2-type dihydride lattice often order in a tetragonal sublattice, of DO22 symmetry corresponding to a RH2.25 stoichiometry. This strongly modifies the various coexisting and/or overlapping commensurate and incommensurate magnetic structures present, sometimes leading to their complete disappearance or to the appearance of magnetic short-range order. Recent neutron-scattering results obtained on the systems RH(D)(2+x), with R = Tb, Dy, Ho, are given as an illustration. (C) 2001 Elsevier Science BY All rights reserved.
引用
收藏
页码:151 / 156
页数:6
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