Electronic structure and valence state of CeAl2 from X-rayabsorption and emission spectroscopy
Soft X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) have been performed on CeAl{sub 2} bulk and nanoparticles of 8 nm to study the quantum size effect of this heavy-fermion compound. XAS and RIXS spectra recorded at selected photon energies, reflect the local unoccupied and occupied electronic states. These spectral shape changes are attributed to surface effects originated from the reducing particle size, which gives rise to different hybridization between the 4f orbitals and conduction band. The Ce in nanoparticles exhibits mixed valencies with a small portion of tetravalent Ce in contrast to the mostly trivalent Ce observed in the bulk CeAl{sub 2}. RIXS spectra show a strong dependence on the excitation energies. The experimental results suggest the different f-electron configurations for bulk and nanoparticle CeAl{sub 2}.
- Research Organization:
- Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US); Advanced Light Source(ALS)
- Sponsoring Organization:
- USDOE Director. Office of Science. Basic Energy Sciences; Tamkang University, Uppsala University
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 925413
- Report Number(s):
- LBNL--57745; BnR: KC0204016
- Journal Information:
- Journal of Electron Spectroscopy and RelatedPhenomena, Journal Name: Journal of Electron Spectroscopy and RelatedPhenomena Vol. 144-147; ISSN JESRAW; ISSN 0368-2048
- Country of Publication:
- United States
- Language:
- English
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