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Electronic band structure of Gd: a consistent description.
K Maiti1, M C Malagoli, E Magnano
1Institut für Festkorperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany.
Physical Review Letters
|April 6, 2001
Summary
Investigating gadolinium (Gd) valence bands reveals that weak dispersion and broadening stem from photoelectron lifetime, not correlation effects. This finding resolves a long-standing conflict in rare earth band structure descriptions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- Rare earth elements, like gadolinium (Gd), exhibit complex electronic band structures.
- Previous theoretical models proposed correlation-induced band narrowing to explain experimental observations in Gd.
- A discrepancy existed between theoretical predictions and experimental data regarding Gd's valence band dispersion.
Purpose of the Study:
- To investigate the dispersion of gadolinium (5d6s)-valence bands.
- To clarify the origins of weak dispersion and unusual broadening observed in Gd spectral features.
- To resolve the long-standing discrepancy in rare earth band structure descriptions.
Main Methods:
- Utilized spin- and angle-resolved photoemission spectroscopy.
- Performed detailed spin analysis of spectral features.
- Analyzed photoelectron lifetime effects on band dispersion.
Main Results:
- Spin analysis confirmed weak dispersion and unusual broadening of Gd (5d6s)-valence bands.
- The observed phenomena are attributed to photoelectron lifetime effects.
- Correlation-induced band narrowing was found to be an inaccurate explanation.
Conclusions:
- The study resolves the discrepancy between theoretical and experimental descriptions of rare earth band structure.
- Photoelectron lifetime is identified as the primary factor influencing Gd valence band dispersion and broadening.
- Provides a more accurate understanding of electronic properties in rare earth materials.