Electronic distribution in the Ba2FeMoO6 double perovskite;: the A-site size effect

被引：25
|
作者：
Nguyen, N
Sriti, F
Martin, C
Bourée, F
Grenèche, JM
Ducouret, A
Studer, F
Raveau, B
机构：
[1] Inst Sci Mat & Rayonnement, UMR 6508 CNRS, Lab CRISMAT, F-14050 Caen, France
[2] Univ Caen, F-14050 Caen, France
[3] LLB Saclay, F-91151 Gif Sur Yvette, France
[4] Univ Maine, UMR CNRS 6087, Lab Phys Etat Condense, F-72085 Le Mans 9, France
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2002年 / 14卷 / 47期
关键词：
D O I：
10.1088/0953-8984/14/47/333
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The double perovskite Ba2FeMoO6 has been studied by neutron powder diffraction, Mossbauer spectrometry and x-ray absorption spectroscopy, and is compared with Sr2FeMoO6. It is shown that the size of the A-site cation has a large effect upon the nature of the low-temperature state, favouring the majority Fe2+/Mo6+ pair in the case of barium and the Fe3+/Mo5+ pair in the case of strontium. In both cases, an electronic transfer appears as T decreases, interpreted as the existence of a minority t(2g)down arrow narrow band, where the electron is itinerant.
引用
收藏
页码：12629 / 12640
页数：12
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