Observation of the antiferroquadrupolar order in DyB2C2 by resonant x-ray scattering
Abstract
We have investigated the antiferroquadrupolar(AFQ) order in DyB2C2 by resonant x-ray scattering. X-rays with energies near the L3 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 β is deduced to be 0.35, not far from the three-dimensional Heisenberg system. We have also succeeded in detecting the diffuse scattering above TQ.
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