NMR Study of Gd(T1-xCox)2 (T=Mn,Fe,Ni,Al)

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  • NMR Study of Gd(T<SUB>1−<I>x</I></SUB>Co<I><SUB>x</SUB></I>)<SUB>2</SUB> (T=Mn, Fe, Ni, Al)
  • NMR Study of Gd(T<sub>1-<i>x</i></sub>Co<sub><i>x</i></sub>)<sub>2</sub> (T=Mn, Fe, Ni, Al)

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Nuclear magnetic resonances of 59Co, 55Mn, 27Al, 155Gd and 157Gd nuclei in Gd(T1−xCox)2 (T=Mn, Fe, Ni, Al) compounds at 4.2 K have been observed for 0≤x≤1. From the analysis of these NMR spectra, the concentration dependence of 59Co hyperfine field is found to be proportional to the sum of the conduction electron polarization arising from nearest neighbor T atoms, and shown that Co atoms carry a magnetic moment induced by the neighboring T atoms. The hyperfine coupling constants of the core polarization in Gd(T1−xCox)2 compounds have been estimated to be larger than those of conduction electron polarization for T=Ni and Al, whereas they are comparable for T=Fe, and are complicated for T=Mn. These results are analyzed in a local environment model.

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