Journal
EUROPHYSICS LETTERS
Volume 74, Issue 4, Pages 672-678Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2005-10563-6
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High temperature Eu-151 Mossbauer measurements provide proof for inhomogeneous mixed-valent behaviour in EuNiP. We observed that EuNiP undergoes a Verwey-type charge delocalisation transition when heated above 470 K prior to the structural gamma-beta phase transition at T approximate to 510 K. 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 gamma-beta phase transition in compounds analogous to EuNiP.
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