Unraveling 5f-6d hybridization in uranium compounds via spin-resolved L-edge spectroscopy

R. D. dos Reis, L. S. I. Veiga, C. A. Escanhoela, J. C. Lang, Y. Joly, F. G. Gandra, D. Haskel and N. M. Souza-Neto ()
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R. D. dos Reis: Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM)
L. S. I. Veiga: Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM)
C. A. Escanhoela: Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM)
J. C. Lang: Advanced Photon Source, Argonne National Laboratory
Y. Joly: Univ. Grenoble Alpes, Inst. NEEL
F. G. Gandra: Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP)
D. Haskel: Advanced Photon Source, Argonne National Laboratory
N. M. Souza-Neto: Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM)

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract The multifaceted character of 5f electrons in actinide materials, from localized to itinerant and in between, together with their complex interactions with 6d and other conduction electron states, has thwarted efforts for fully understanding this class of compounds. While theoretical efforts abound, direct experimental probes of relevant electronic states and their hybridization are limited. Here we exploit the presence of sizable quadrupolar and dipolar contributions in the uranium L3-edge X-ray absorption cross section to provide unique information on the extent of spin-polarized hybridization between 5f and 6d electronic states by means of X-ray magnetic circular dichroism. As a result, we show how this 5f-6d hybridization regulates the magnetism of each sublattice in UCu2Si2 and UMn2Si2 compounds, demonstrating the potentiality of this methodology to investigate a plethora of magnetic actinide compounds.

Date: 2017
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DOI: 10.1038/s41467-017-01524-1

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