XMCD Characterization of the Ferromagnetic State of Yb14MnSb11
X-ray magnetic circular dichroism (XMCD) measurements on Yb14MnSb11 provide experimental evidence of a moment of 5 μB on Mn, with partial cancellation by an opposing moment on the Sb4 cage surrounding each Mn ion. The compound is isostructural to Ca14AISb11, with Mn occupying the AI site in the AISb4 9- discrete tetrahedral, anionic unit. Bulk magnetization measurements indicate a saturation moment of 3.90 ± 0.02 μB/formula unit consistent with four unpaired spins and implying a Mn3+, high-spin d4 state. XMCD measurements reveal that there is strong dichroism in the Mn L23 edge, the Sb M45 edge shows a weak dichroism indicating antialignment to the Mn, and the Yb N45 edge shows no dichroism. Comparisons of the Mn spectra with theoretical models for Mn2+ show excellent agreement. The bulk magnetization can be understood as Mn with a moment of 5 μB and a 2+ configuration, with cancellation of one spin by an antialigned moment from the Sb 5p band of the Sb4 cage surrounding the Mn.
A. P. Holm et al., "XMCD Characterization of the Ferromagnetic State of Yb14MnSb11," Journal of the American Chemical Society, vol. 124, no. 33, pp. 9894-9898, American Chemical Society(ACS), Aug 2002.
The definitive version is available at http://dx.doi.org/10.1021/ja020564y
Keywords and Phrases
Magnetization; Manganese; Method of moments; Ytterbium compounds; Ferromagnetism; aluminum; anion; antimony; calcium; ferromagnetic material; lanthanide; nitrogen; ytterbium; binding site; chemical structure; circular dichroism; dipole; geometry; intermethod comparison; magnetic field; measurement; molecular model; nuclear magnetic resonance imaging; spin labeling; structure analysis; theory; x ray magnetic circular dichroism
International Standard Serial Number (ISSN)
Article - Journal
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