Verwey-type transition in EuNiP

Ksenofontov, V.; Kandpal, Hem C.; Ensling, J.; Waldeck, M.; Johrendt, D.; Mewis, A.; Gütlich, P.; Felser, C.

doi:10.1209/epl/i2005-10563-6

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Verwey-type transition in EuNiP

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Ksenofontov, V., Kandpal, H. C., Ensling, J., Waldeck, M., Johrendt, D., Mewis, A., et al. (2006). Verwey-type transition in EuNiP. EPL, 74(4), 672-678. doi:10.1209/epl/i2005-10563-6.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-6719-F

Abstract

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.