The influence of pd mixing and magnetic interactions on the pre-edge peak intensity at the Co (Ni) K absorption edge in Co(Ni)(c)Mg1-cO solid solutions

被引：26

作者：

Kuzmin, A ^{[1
]}

Mironova, N ^{[1
]}

Purans, J ^{[1
]}

机构：

[1] LATVIAN ACAD SCI,NUCL RES CTR,LV-2169 SALASPILS,LATVIA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1997年 / 9卷 / 24期

关键词：

D O I：

10.1088/0953-8984/9/24/023

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

In this work, the variation of the pre-edge peak at the Co (Ni) K absorption edge in MecMg1-cO (Me = Co, Ni) solid solutions is studied upon dilution. Its intensity is attributed to the number of \3d(n+i)L(i)] (i > 0) ground-state configurations with oxygen 2p hole(s) denoted by L-i. Upon dilution, the pre-edge peak intensity grows by about a factor of 1.2 in NicMg1-cO and about a factor of 2.8 in CocMg1-cO. This fact is explained by an increase of the 2p(O)-3d(Me) mixing. The results obtained are in agreement with the modifications of the local atomic structure around Co2+ and Ni2+ ions, probed by extended x-ray absorption fine structure (EXAFS), and optical spectroscopies. The correlation between the concentration dependences of the pre-edge peak intensity and the Neel temperature for solid solutions is also discussed.

引用

页码：5277 / 5286

页数：10

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