Direct Observation of Antiferro-Quadrupolar Ordering - Resonant X-ray Scattering Study of DyB2C2

Details Direct Observation of Antiferro-Quadrupolar Ordering - Resonant X-ray Scattering Study of DyB2C2 Direct Observation of Antiferro-Quadrupolar Ordering - Resonant X-ray Scattering Study of DyB2C2

1999-08-30

arxiv.org/abs/cond-mat/9908436v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures (typos corrected in Fig.1 and 2)

Scientific paper

10.1103/PhysRevLett.84.2706

Antiferroquadrupolar (AFQ) ordering has been conjectured in several rare-earth compounds to explain their anomalous magnetic properties. No direct evidences for AFQ ordering, however, have been reported. Using the resonant x-ray scattering technique near the Dy L_III absorption edge, we have succeeded in observing the AFQ order parameter in DyB2C2 and analyzing the energy and polarization dependence. Much weaker coupling between orbital degrees of freedom and lattice in 4f electron systems than in 3d compounds provides an ideal platform to study orbital interactions originated from electronic mechanisms.

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