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A Spin-Canted Antiferromagnetic Ground State in CeRu 2 Al 10

DOI: 10.7566/JPSJ.87.013706 DOI Help

Authors: Philip Dean (Durham University) , Yuji Muro (Toyama Prefectural University) , Toshiro Takabatake (Hiroshima University) , Peter D. Hatton (Durham University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of The Physical Society Of Japan , VOL 87

State: Published (Approved)
Published: January 2018
Diamond Proposal Number(s): 10010

Abstract: Resonant polarised soft x-ray scattering at the cerium M-edge has been used to refine the magnetic structure of CeRu2Al10. A strong resonant feature at the cerium MIV-edge was observed at the disallowed (0,1,0) (0,1,0) Bragg position, consistent with previous neutron diffraction refinement of the moment pointing along the c-axis. The magnetic peak was found to have a temperature dependence expected for the paramagnetic–antiferromagnetic transition, disappearing above around 30 K. The polarisation dependence of the scattered x-rays conclusively shows that the low-temperature antiferromagnetic structure is non-collinear in nature. Fitting the polarisation dependence of the obtained Stokes parameters was undertaken with models for canting along either the a-axis or the b-axis. The experimental data agrees better with the model involving canting towards the a-axis. However, this is inconsistent with the Cmcm space group, suggestive of a symmetry lowering to either Pmnm or Cm2m. The resulting model is then achieved with a 9.6° ± 1.1 canting of the moments towards the a-axis. No resonance features were observed at the ruthenium L-edges. This suggests that the ruthenium atoms play no part in the antiferromagnetic ordering.

Subject Areas: Physics

Instruments: I10-Beamline for Advanced Dichroism

Other Facilities: ESRF

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