Experimental observation of temperature and magnetic-field evolution of the 4f states in CeFe2 revealed by soft x-ray magnetic circular dichroism

Experimental observation of temperature and magnetic-field evolution of the 4f states in CeFe2... We revisit the delocalized character of the 4f states of CeFe2 in the ferromagnetically ordered phase by x-ray magnetic circular dichroism (XMCD) in x-ray absorption spectroscopy (XAS) with improved data quality using single crystals. Surprisingly, the Ce M4,5 XMCD spectral shape changes significantly as a function of temperature and applied magnetic field, with no concomitant changes in the spectral shape of the Ce M4,5 XAS as well as the Fe L2,3 XAS and XMCD. This unusual behavior is characterized by the J=7/2 states in a 4f1 configuration mixed into the J=5/2 ground state. Such extreme sensitivity of the Ce 4f states to the external perturbations can be related to the magnetic instability toward an antiferromagnetic phase in CeFe2. Our experimental data presented here provide valuable insights into the underlying physics in strongly hybridized ferromagnetic Ce compounds. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Experimental observation of temperature and magnetic-field evolution of the 4f states in CeFe2 revealed by soft x-ray magnetic circular dichroism

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Experimental observation of temperature and magnetic-field evolution of the 4f states in CeFe2 revealed by soft x-ray magnetic circular dichroism

Abstract

We revisit the delocalized character of the 4f states of CeFe2 in the ferromagnetically ordered phase by x-ray magnetic circular dichroism (XMCD) in x-ray absorption spectroscopy (XAS) with improved data quality using single crystals. Surprisingly, the Ce M4,5 XMCD spectral shape changes significantly as a function of temperature and applied magnetic field, with no concomitant changes in the spectral shape of the Ce M4,5 XAS as well as the Fe L2,3 XAS and XMCD. This unusual behavior is characterized by the J=7/2 states in a 4f1 configuration mixed into the J=5/2 ground state. Such extreme sensitivity of the Ce 4f states to the external perturbations can be related to the magnetic instability toward an antiferromagnetic phase in CeFe2. Our experimental data presented here provide valuable insights into the underlying physics in strongly hybridized ferromagnetic Ce compounds.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.035151
Publisher site
See Article on Publisher Site

Abstract

We revisit the delocalized character of the 4f states of CeFe2 in the ferromagnetically ordered phase by x-ray magnetic circular dichroism (XMCD) in x-ray absorption spectroscopy (XAS) with improved data quality using single crystals. Surprisingly, the Ce M4,5 XMCD spectral shape changes significantly as a function of temperature and applied magnetic field, with no concomitant changes in the spectral shape of the Ce M4,5 XAS as well as the Fe L2,3 XAS and XMCD. This unusual behavior is characterized by the J=7/2 states in a 4f1 configuration mixed into the J=5/2 ground state. Such extreme sensitivity of the Ce 4f states to the external perturbations can be related to the magnetic instability toward an antiferromagnetic phase in CeFe2. Our experimental data presented here provide valuable insights into the underlying physics in strongly hybridized ferromagnetic Ce compounds.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 27, 2017

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