X-ray scattering study of the interplay between magnetism and structure in CeSb

Desmond Francis McMorrow, J.-G. Lussier, Bente Lebech, S.Å. Sørensen, M.J. Christensen, O. Vogt

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Abstract

The chemical and magnetic structures of CeSb have been investigated using high-resolution x-ray scattering techniques. Experiments performed in the non-resonant regime (x-ray energy of E = 9.4 keV) showed that when the sample was cooled below its Neel temperature of T-N approximate to 16.5 K, peaks appeared with commensurate wave vectors q. From their polarization and wave-vector dependence, the peaks are deduced to arise mainly from a periodic lattice distortion. In the resonant regime, when the x-ray energy was tuned to the L absorption edges of Ce, weak, resonantly enhanced magnetic scattering was observed at the L(II) edge (E = 6.164 keV), with no scattering found at either L(I) or L(III) Of the six possible zero-field commensurate magnetic structures reported in earlier neutron experiments, we found the phases with q(m) = 2/3 and 4/7 only, with the domain that has moments perpendicular to the surface absent. Neutron scattering experiments on the same single crystal confirm that the absence of the other phases is a bulk property of that particular crystal, but the absence of the domain is a feature of the near-surface region. These results are discussed in terms of the currently accepted model of the magnetic structure of CeSb.
Original languageEnglish
JournalJournal of Physics: Condensed Matter
Volume9
Issue number5
Pages (from-to)1133-1148
ISSN0953-8984
DOIs
Publication statusPublished - 1997

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