CORRELATION BETWEEN MIXED-VALENCE BEHAVIOR OF CERIUM AND THE MAGNETIC AND SUPERCONDUCTING PHENOMENA OF CEFE2 AND CERU2

被引：11

作者：

CHABOY, J ^{[1
]}

GARCIA, J ^{[1
]}

MARCELLI, A ^{[1
]}

机构：

[1] INFN, NAZL FRASCATI LAB, I-00044 FRASCATI, ITALY

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 104卷

关键词：

D O I：

10.1016/0304-8853(92)90972-Q

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This contribution concerns an X-ray absorption investigation of the cubic Laves phase rare earth compounds CeFe2, CeRu2 and their related hydrides. These compounds have been investigated by Extended X-ray Absorption Fine Structure (EXAFS) both at cerium and iron sites and by X-ray Absorption Near Edge Spectroscopy (XANES) at different edges of both ruthenium and iron species. The hydrogen absorption process is correlated with the suppression of the cerium fluctuating valence state in the case of CeFe2, while the intermediate valence character is detected in CeRu2 also upon the absorption process. These results and the change of 3d-5d hybridization determined by structural disorder effects in the hydridate phase of these systems can explain the anomalous magnetic behaviour of the hydridate phases when compared with those of the whole series REFe2 and RERu2.

引用

页码：661 / 662

页数：2

共 8 条

[1] CHANGES OF MAGNETIC-PROPERTIES UPON HYDROGEN ABSORPTION IN RARE-EARTH IRON COMPOUNDS [J].