Element-Specific Probe of the Magnetic and Electronic Properties of Dy incar-Fullerenes

The magnetic and electronic properties of a single atom and a pair of Dy atoms encapsulated inside fullerene carbon cages have been examined using X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) as well as resonant photoelectron spectroscopy (RESPES) across the Dy M(...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2006-04, Vol.110 (14), p.7289-7295
Main Authors: BONDINO, F., CEPEK, C., TAGMATARCHIS, N., PRATO, M., SHINOHARA, H., GOLDONI, A.
Format: Article
Language:English
Subjects:
Algorithms
Circular Dichroism
Electromagnetic Fields
Fullerenes - chemistry
Molecular Conformation
Spectrum Analysis
Temperature
X-Rays
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Summary:The magnetic and electronic properties of a single atom and a pair of Dy atoms encapsulated inside fullerene carbon cages have been examined using X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) as well as resonant photoelectron spectroscopy (RESPES) across the Dy M(4,5)-edge. The comparison of the measured XAS spectra with multiplet calculations indicates that the encaged Dy has a 4f( 9) configuration. The presence of Dy 5d spectral weight in the valence band is not detected by RESPES, indicating that Dy is in a formally trivalent state. The evolution of the encaged Dy orbital and spin moments of the 4f orbitals as a function of the applied magnetic field and temperature has been obtained from XMCD measurements. At 6.9 T and 4 K, both the orbital and the spin magnetic moments of the encaged Dy 4f electrons are dramatically smaller than those expected for the free Dy(3+) at saturation.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp055938z