Electronic and magnetic properties of cubic lave phase compounds
Band structure calculations and magnetic measurements were performed on RM2-based compounds, where R is a rare-earth or yttrium and M = Fe, Co or Ni. The exchange enhanced paramagnets as Y(CoxNi1-x)2, at T 10 K, show a T2 type dependence of magnetic susceptibilities. Above a char...
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
D.Ghitu Institute of Electronic Engineering and Nanotechnologies
2005
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/3b49cbf11d7044d6bcdbb3f4900c0e00 |
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| Sumario: | Band structure calculations and magnetic measurements were performed on RM2-based
compounds, where R is a rare-earth or yttrium and M = Fe, Co or Ni. The exchange enhanced
paramagnets as Y(CoxNi1-x)2, at T 10 K, show a T2
type dependence of magnetic
susceptibilities. Above a characteristic temperature, T*
, a Curie-Weiss behaviour was
evidenced. The computed mean square amplitude of spin fluctuations, at high temperatures,
describes well the experimentally determined effective moments. The transition of cobalt
atoms from nonmagnetic to magnetic state was analysed. A small nickel moment is induced
in RNi2 compounds with magnetic rare-earths. The exchange interactions influence little iron
moments. The different contributions to the R5d bands polarizations are also analyzed. |
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