XANES study of rare-earth valency in LRu 4 P 12 (L=Ce and Pr)
XANES study of rare-earth valency in LRu 4 P 12 (L=Ce and Pr)
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LRu 4 P 12 (L=Ce 和 Pr) 中稀土价态的 XANES 研究
DOI：
10.1103/physrevb.60.13253
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发表时间：
1999
影响因子：
3.7
通讯作者：
M. Ishii
中科院分区：
文献类型：
--
作者：
C. Lee;H. Oyanagi;C. Sekine;I. Shirotani;M. Ishii
利用L2，3边X射线吸收近边结构（XANES）谱研究了LRu 4P 12（L = Ce和Pr）中Ce和Pr的价态。Ce-L3 XANES光谱表明Ce主要是三价的，但4f态与配体轨道强烈杂交。CeRu_4P_（12）的带隙似乎是由4f电子的强杂化形成的。Pr-L2 XANES谱表明Pr在20 < T < 300 K的温度范围内以三价态存在。我们发现PrRu 4P 12在TMI = 60 K时的金属-绝缘体（MI）转变并非源于Pr价态波动。
Valency of Ce and Pr in LRu4P12 (L = Ce and Pr) was studied by L2,3-edge x-ray absorption near-edge structure (XANES) spectroscopy. The Ce-L3 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-L2 XANES spectra indicate that Pr exists in trivalent state over a wide range in temperature, 20 < T < 300 K. We find that the metal-insulator (MI) transition at TMI = 60 K in PrRu4P12 does not originate from Pr valence fluctuation.