Photoemission experiments on YbInCu{sub 4}: Surface effects and temperature dependence
- Fachrichtung Experimentalphysik, Universitaet des Saarlandes, 66041, Saarbruecken (Germany)
- Los Alamos National Laboratory, Los Alamos, New Mexico, 87545 (United States)
- Randall Laboratory, University of Michigan, Ann Arbor, Michigan, 48109-1120 (United States)
- Physikalisches Institut, Universitaet Frankfurt, 60054, Frankfurt (Germany)
We present temperature-dependent photoemission (PES) measurements on single-crystalline YbInCu{sub 4}, a stoichiometric material that shows an isostructural first-order valence transition at T{sub a}{approx}60 K. The results of the analysis of the PES data show peculiar differences to other, bulk-sensitive measurements: (a) a lack of the sharp first-order valence transition and (b) the Yb valence {emdash} determined directly from the 4f intensity ratio {emdash} lies substantially below x-ray absorption (XAS) results over the whole investigated temperature range. We discuss these discrepancies with particular attention to surface effects and conclude that the PES results are due to a distorted near-surface region which differs in its physical properties significantly from the volume material. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 300095
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 58, Issue 19; Other Information: PBD: Nov 1998
- Country of Publication:
- United States
- Language:
- English
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