On the determination of the hyperfine fields in various R2Fe14B compounds
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Pure rotational transitions of 52Cr14N and 98Mo14N radicals in their X 4Σ− state were recorded using a pump/probe microwave-optical double resonance (PPMODR) technique from which the hyperfine parameters of 14N (I=1) were precisely determined. In addition, the (0,0) A 4Π–X 4Σ band system of 53CrN was recorded from which the hyperfine parameters of 53Cr (I=32) were determined. The newly determined hyperfine interactions for 53Cr and 14N in CrN and 14N in MoN and the previously determined hyperfine interactions for other early transition metal mononitrides were analyzed using a simple, single configurational, model. The improved set of fine structure parameters for the CrN and MoN are discussed in terms of possible electronic state distributions.
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The Fermi contact contribution to the hyperfine fields on Fe nuclei in Y2Fe17, Y6Fe23, YFe3, YFe2, and Y2Fe14B has been calculated by means of first principles self-consistent band structure calculations. The calculated and experimental hyperfine fields are strongly correlated, but, similar to results reported earlier for elemental Fe, the absolute values of all calculated hyperfine fields are systematically too small. The 4s electron contribution to the hyperfine fields is shown to result in significant deviations from a simple proportionality relation between the hyperfine fields and the local Fe moments.
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This chapter contains sections titled: Introduction Origin of the Anisotropic Part of the Hyperfine Interaction Determination and Interpretation of the Hyperfine Matrix Combined g and Hyperfine Anisotropy Multiple Hyperfine Matrices Systems With I > ½ Hyperfine Powder Lineshapes References Notes Further Reading Problems
Matrix (chemical analysis)
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