Volume 74, Number 4, May 2006
|Page(s)||672 - 678|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||05 April 2006|
Verwey-type transition in
Institut für Anorganische Chemie und Analytische Chemie Johannes Gutenberg Universität - D-55099 Mainz, Germany
2 Institut für Anorganische Chemie und Strukturchemie II Heinrich-Heine-Universität - D-40225 Düsseldorf, Germany
Accepted: 10 March 2006
High temperature 151Eu Mössbauer measurements provide proof for inhomogeneous mixed-valent behaviour in . We observed that undergoes a Verwey-type charge delocalisation transition when heated above prior to the structural γ-β phase transition at . This finding confirms the results of photoemission spectroscopy in the isostructural compound EuPdP and of TB-LMTO-ASA band structure calculations. We discuss the role of a van Hove singularity associated with a high density of 4f states close to the Fermi energy in inhomogeneous mixed europium valency, and the microscopic mechanism of γ-β phase transition in compounds analogous to .
PACS: 71.20.-b – Electron density of states and band structure of crystalline solids / 76.80.+y – Mössbauer effect, other gamma-ray spectroscopy
© EDP Sciences, 2006
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