Verwey-type transition in EuNiP

被引：16

作者：

Ksenofontov, V ^{[1
]}

Kandpal, HC

Ensling, J

Waldeck, M

Johrendt, D

Mewis, A

Gütlich, PG

Felser, C

机构：

[1] Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-55099 Mainz, Germany

[2] Univ Dusseldorf, Inst Anorgan Chem & Strukt Chem 2, D-40225 Dusseldorf, Germany

来源：

EUROPHYSICS LETTERS | 2006年 / 74卷 / 04期

关键词：

D O I：

10.1209/epl/i2005-10563-6

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页码：672 / 678

页数：7

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