STUDY OF THE MAGNETIC-ORDERING TEMPERATURE AND OF THE MAGNETIC-STRUCTURE OF THE GREEN PHASE Y2BACUO5 BY FE-57 MOSSBAUER-SPECTROSCOPY

被引：17

作者：

MEYER, C

HARTMANNBOUTRON, F

GROS, Y

STROBEL, P

THOLENCE, JL

PERNET, M

机构：

[1] CNRS,CRISTALLOG LAB,F-38042 GRENOBLE,FRANCE

[2] CNRS,CTR RECH TRES BASSES TEMP,F-38042 GRENOBLE,FRANCE

来源：

SOLID STATE COMMUNICATIONS | 1990年 / 74卷 / 12期

关键词：

D O I：

10.1016/0038-1098(90)91003-Y

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The "green phase" Y2BaCuO5 was doped with 1% 57Fe. The susceptibility of the sample exhibits a broad maximum around 25 K. According to 57Fe Mössbauer spectroscopy, 3D magnetic ordering appears at 15.5 K. Iron, being in the Fe3+ high spin "S state", is expected to reflect the orientations of the copper moments: copper ions are found to be both crystallographically and magnetically equivalent; their moments make an angle ∼ 40° with the c axis (7.13 Å) of Chattopadhyay et al. and an angle ∼ 20° with the basis of the oxygen pyramid which surrounds each of them. The low transition temperature originates from the very long superexchange paths CuOOCu. Possible low dimensional character of the transition is examined. © 1990.

引用

页码：1339 / 1345

页数：7

共 19 条

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AGLADZE NI, 1988, JETP LETT+, V48, P45

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