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Direct and quantitative determination of the orbital ordering in CeB

DOI: 10.1209/epl/i2004-10271-9 DOI Help

Authors: Yoshi Tanaka (RIKEN, Japan) , U Staub (SLS, Switzerland) , K Katsumata (RIKEN, Japan) , S. W Lovesey (Diamond Light Source) , J. E Lorenzo (Laboratoire de Cristallographie, CNRS, France) , Y Narumi (KYOKUGEN, Osaka University, Japan) , V Scagnoli (SLS, Switzerland) , S Shimomura (Department of Physics, Keio University Hiyoshi, Japan) , Y Tabata (Graduate School of Science, Osaka University, Japan) , Y Onuki (Graduate School of Science, Osaka University, Japan) , Y Kuramoto (Graduate School of Science, Tohoku University, Japan) , A Kikkawa (RIKEN, Japan) , T Ishikawa (RIKEN, Japan) , H Kitamura (RIKEN, Japan)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: EPL (Europhysics Letters) , VOL 68 (5) , PAGES 671 - 677

State: Published (Approved)
Published: December 2004

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 TN = 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.

Journal Keywords: Condensed Matter: Electrical, Magnetic And Optical

Subject Areas: Physics


Technical Areas: Theoretical Physics