Resonant X-Ray Scattering from URu_{2}Si_{2}

Details Resonant X-Ray Scattering from URu_{2}Si_{2} Resonant X-Ray Scattering from URu_{2}Si_{2}

2004-09-29

arxiv.org/abs/cond-mat/0409735v1

J. Phys. Soc. Jpn., vol.74 (2005) pp.765-772.

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures, submitted to JPSJ

Scientific paper

10.1143/JPSJ.74.765

Based on a localized crystal electric field model for the U^{4+} in the (5f)^2-configuration, we analyze the resonant x-ray scattering spectra around U M_{IV} and M_{V} edges in URu_{2}Si_{2}, taking full Coulomb and spin-orbit interactions into account. We consider two level schemes, a singlet model of Santini and Amoretti and a doublet model of Ohkawa and Shimizu, and assume the antiferroquadrupolar order and the antiferromagnetic order as candidates for the ambient pressure phase and the high pressure phase. It is found that the spectral shapes as a function of photon energy are independent of the assumed level scheme, but are quite different between the antiferroquadrupole and antiferromagnetic phases, This may be useful to determine the character of the ordered phase.

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