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.

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页码：12629 / 12640

页数：12

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