Magnetically ordered compound

Clearly, all hyperfine interactions can occur simultaneously. In magnetically ordered compounds with a non-vanishing electric field gradient, the shape of the spectrum depends on the relative strengths of the magnetic and the electric quadrupole interaction. In catalysts, the usual situation is that the quadrupole interac-... 

Gd compounds. A kink occurs in the p vs. T curves of the magnetically ordered compounds. Kinks are also observed in the p vs. T curve of the compounds PrCuz and SmCu2 at 8 K and 25 K, respectively. The data for PrCu2 are analysed below, while no explanation has been offered for the kink in the resistivity of SmCuz. 

In the second chapter (94) of the present volume, Dormann reviews the advances that have been made in NMR spectroscopy over the past 12 years, since Barnes overview on NMR, EPR and Mossbauer effect, in volume 2 of the HANDBOOK. Dormann s contribution is more specialized since it concentrates on NMR in inter-metallic, magnetically ordered compounds. As Dormann points out, considerable progress has been made in experimental techniques which enable experimentalists to study materials and perform measurements that could not have been done ten years ago, and this has led to a much better understanding and comprehension of these magnetic lanthanide materials. These experimental advances allow the determination of the temperature dependence of spontaneous magnetization, direction of easy magnetization, and the electronic structure of intermetallic compounds with non-magnetic components. 

High-field Knight shift in magnetically ordered compounds... 

In general it is difficult to derive more than three distinct neighbour contributions by NMR line shape analysis in magnetically ordered compounds, without... 

For a general introduction to the field of NMR in magnetically ordered compounds with non-S state lanthanide ions, we refer the reader to Taylor (1971) or McCausland and Mackenzie (1980), where the interplay of the exchange and crystal-field interactions has been analysed. Generally, for cubic systems like RAI2 at least a three-parameter mean-field model is adopted, based on a single-ion Hamiltonian comprising a crystal field of cubic symmetry [CEF parameters W, x Barnes (1979)] and an isotropic molecular field constant (A) ... 

Mass enhancement due to the electron-magnon interaction in magnetically ordered compounds is large compared to the one due to the electron-phonon interaction. The mass enhancement factor is in the range of 1-2. 

We may return to the meaning of interatomic distances and of the coordination number JV. It is a minor detail that diffraction of X-rays indicates the centre of electronic density and diffraction of neutrons (disregarding the effects of partly filled shells observed in magnetically ordered compounds) indicates the position of the nuclei. Even when not demanded by symmetry, these two techniques agree very closely, and actually, the electronic densities seem to be a superposition of standard atomic quantities, with the marginal exception of hydrogen atoms, which are deformed and somewhat contracted (as predicted by... 

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