Verwey-type transition in

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

doi:10.1209/epl/i2005-10563-6

All issues

Volume 74 / No 4 (May 2006)

Europhys. Lett., 74 4 (2006) 672-678

Abstract

Issue		Europhys. Lett. Volume 74, Number 4, May 2006


Page(s)		672 - 678
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10563-6
Published online		05 April 2006

Europhys. Lett., 74 (4), pp. 672-678 (2006)

Verwey-type transition in $\chem{EuNiP}$

V. Ksenofontov¹, Hem C. Kandpal¹, J. Ensling¹, M. Waldeck¹, D. Johrendt², A. Mewis², P. Gütlich¹ and C. Felser¹

¹ 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

Received: 8 December 2005
Accepted: 10 March 2006

Abstract

High temperature ¹⁵¹Eu Mössbauer measurements provide proof for inhomogeneous mixed-valent behaviour in $\chem{EuNiP}$ . We observed that $\chem{EuNiP}$ undergoes a Verwey-type charge delocalisation transition when heated above $470\un{K}$ prior to the structural γ-β phase transition at $T \approx 510\un{K}$ . 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 γ-β phase transition in compounds analogous to $\chem{EuNiP}$ .

PACS: 71.20.-b – Electron density of states and band structure of crystalline solids / 76.80.+y – Mössbauer effect, other gamma-ray spectroscopy

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