Direct and quantitative determination of the orbital ordering in CeB 6 by X-ray diffraction

Y. Tanaka, U. Staub, K. Katsumata, S. W. Lovesey, J. E. Lorenzo, Y. Narumi, V. Scagnoli, S. Shimomura, Y. Tabata, Y. Onuki, Y. Kuramoto, A. Kikkawa, T. Ishikawa, H. Kitamura

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36 Citations (Scopus)

Abstract

Results of non-resonant X-ray Bragg diffraction by CeB6 are reported. This material has been described in terms of a simple antiferro-quadrupolar order below TQ = 3.2 K. We determine for the first time, directly and quantitatively the orbital ordering in this material. In particular, we find direct evidence for a simultaneous ordering of a quadrupole (QP) and a hexadecapole (HDP) moments below TQ. From a strong dependence of the Bragg intensity on applied magnetic field in phase II, we conclude that octupole (OP) moments are induced and are coupled to the QP and HDP moments. When spontaneous magnetic dipole order sets in below T N = 2.4 K (phase III), a large enhancement of the Bragg intensity confirms the coupling between the dipole and the QP, OP and HDP moments.

Original languageEnglish
Pages (from-to)671-677
Number of pages7
JournalEurophysics Letters
Volume68
Issue number5
DOIs
Publication statusPublished - 2004 Dec

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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