Antiferroquadrupole order and magnetic field induced octupole in CeB6

Physical Review B Volume 85 Issue 17 Page 174417- published_at 2012
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Title ( eng )
Antiferroquadrupole order and magnetic field induced octupole in CeB6
Creator
Yonemura Takumi
Kunimori Keisuke
Iga Fumitoshi
Nagao Tatsuya
Igarashi Jun-ichi
Source Title
Physical Review B
Volume 85
Issue 17
Start Page 174417
Abstract
We have studied the antiferroquadrupole ordered phase of CeB6 in magnetic fields by resonant x-ray diffraction. By analyzing the significant change in the energy spectrum on reversing the field direction along [1̅ 1 0], we have deduced field dependencies of the antiferro components of magnetic dipole, electric quadrupole, and magnetic octupole moments which are simultaneously induced in the Ce 4f orbital with a propagation vector (1/2,1/2,1/2). The data treatments are based on theoretically calculated spectral functions. The existence of the field-induced octupole is also concluded for other field directions. We also show direct evidence for the formation of a linear-combination-type antiferroquadrupole order parameter in magnetic fields, which is expressed as 〈αOyz+βOzx+γOxy〉 and changes continuously with the field direction (α,β,γ). A possibility of observing the quadrupolar fluctuation is also pointed out.
NDC
Physics [ 420 ]
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2012
Rights
(c) 2012 American Physical Society
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.85.174417
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.85.174417