XANES study of rare-earth valency in LRu4P12 (L = Ce and Pr)

被引：55

作者：

Lee, CH

Oyanagi, H

Sekine, C

Shirotani, I

Ishii, M

机构：

[1] Electrotech Lab, Tsukuba, Ibaraki 3058568, Japan

[2] Muroran Inst Technol, Muroran, Hokkaido 050, Japan

[3] JASRI, Kamigori, Hyogo 67812, Japan

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.60.13253

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Valency of Ce and Pr in LRu4P12 (L=Ce and Pr) was studied by L-2,L-3-edge x-ray absorption near-edge structure: (XANES) spectroscopy. The Ce-L-3 XANES spectrum suggests that Ce is mainly trivalent, but the 4f state strongly hybridizes with ligand orbitals. The band gap of CeRu4P12 seems to be formed by strong hybridization of 4f electrons. Pr-L-2 XANES spectra indicate that Pr exists in trivalent state over a wide range in temperature, 20 K less than or equal to T less than or equal to 300 K. We find that the metal-insulator (MI) transition at T-MI = 60 K in PrRu4P12 does not originate from Pr valence fluctuation. [S0163-1829(99)01244-8].

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页码：13253 / 13256

页数：4

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