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Ce multipoles in phase IV of Ce0.7La0.3B6 inferred from resonant x-ray Bragg diffraction

DOI: 10.1103/PhysRevB.75.054401 DOI Help

Authors: S. Lovesey (Diamond Light Source) , J. Fernández-rodríguez (Departamento de Física, Universidad de Oviedo, Spain) , J. Blanco (Departamento de Física, Universidad de Oviedo, Spain) , Y. Tanaka (RIKEN SPring-8 Center, Harima Institute, Japan)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 75 (5)

State: Published (Approved)
Published: February 2007

Abstract: Low temperature properties of Ce(0.7)La(0.3)B(6) in zero external magnetic field in a small temperature range, below 1.4 K, point to the existence of a phase IV characterized by a nonconventional electron ground state with no ordering of 4f magnetic dipole Ce moments. We report a successful analysis of extensive observations on phase IV made by resonant x-ray Bragg diffraction at the Ce L2 absorption edge. In the analysis, we explore contributions to diffraction by the four domains arranged with triad axes placed along [111], [111], [11 1], and [1 11] and from all possible Ce multipoles up to hexadecapoles. Ce quadrupoles and octupoles adequately represent intensity observed in the azimuthal-angle scans for both rotated and unrotated polarization channels at the Bragg reflection (3/23/23/2) measured by Mannix et al. [Phys. Rev. Lett. 95, 117206 (2005)]. In this scenario, the magnetic properties of the alloy are due to an antiferromotif of octupoles. While the antiferroquadrupole contribution calculated for (3/23/23/2) has a small influence in the azimuthal-angle dependence we predict that for the reflection (1/21/21/2) this contribution would radically influence the azimuthal dependence of the intensity. We demonstrate that available data are adequately described also by one microdomain with antiferro-ordering of Ce octupoles and hexadecapoles. In this case, octupole ordering signifies the departure from a cubic chemical structure.

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