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Weak anisotropic X-ray magnetic linear dichroism at the Eu M-4,M-5 edges of ferromagnetic EuO(001): Evidence for 4f-state contributions

DOI: 10.1103/PhysRevLett.100.067403 DOI Help
PMID: 18352515 PMID Help

Authors: Elke Arenholz (Lawrence Berkeley National Laboratory) , Andreas Schmehl (Universit├Ąt Augsburg) , Darrell G. Schlom (Penn State University) , Gerrit Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 100 (6)

State: Published (Approved)
Published: January 2008

Abstract: We have observed a weak anisotropic x-ray magnetic linear dichroism (AXMLD) at the Eu M(4,5) edges of ferromagnetic EuO(001), which indicates that the 4f states are not rotationally invariant. A quantitative agreement of the AXMLD is obtained with multiplet calculations where the 4f state is split by an effective cubic crystalline electrostatic field. The results indicate that the standard model of rare earths, where 4f electrons are treated as core states, is not correct and that the 4f orbitals contribute weakly to the magnetic anisotropy.

Subject Areas: Physics

Technical Areas: