Observation of the antiferroquadrupolar order in DyB2C2 by resonant x-ray scattering

Abstract

We have investigated the antiferroquadrupolar(AFQ) order in DyB${}_2$C${}_2$ by resonant x-ray scattering. X-rays with energies near the $L_3$ absorption edge of Dy were employed. Superlattice peaks that correspond to three kinds of propagation vectors of (1 0 0), (1 0 1/2) and (0 0 1/2) were investigated in detail with polarization analyses. The experimental results are analyzed using a formalism on resonant x-ray scattering and a model of the AFQ order. The magnetic and quadrupolar scatterings are explained by the model satisfactorily. A detailed investigation on the critical behavior of the AFQ ordering is also reported. The critical exponent $\beta$ is deduced to be 0.35, not far from the three-dimensional Heisenberg system. We have also succeeded in detecting the diffuse scattering above $T_Q$.

11pages, 9figures

References in corpus (3)

• Direct Observation of Antiferro-Quadrupolar Ordering - Resonant X-ray Scattering Study of DyB2C2
• Antiferro-quadrupole Ordering of CeB${}_6$ Studied by Resonant X-ray Scattering
• Theory of Orbital Ordering, Fluctuation and Resonant X-ray Scattering in Manganites

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