Resonant photoemission and correlated satellites in K2CoF4

被引:5
|
作者
Sangaletti, L
Parmigiani, F
Ratner, E
机构
[1] Univ Brescia, Ist Nazl Fis Mat, I-25123 Brescia, Italy
[2] Univ Brescia, Dipartimento Chim & Fis Ingn & Mat, I-25123 Brescia, Italy
[3] Univ Cattolica, Ist Nazl Fis Mat, I-25121 Brescia, Italy
[4] Univ Cattolica, Dipartimento Matemat & Fis, I-25121 Brescia, Italy
[5] Deutsch Res, Mountain View, CA 94040 USA
来源
PHYSICAL REVIEW B | 1998年 / 57卷 / 16期
关键词
D O I
10.1103/PhysRevB.57.10175
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Resonant photoemission experiments at the Co 3p-->3d absorption threshold are used to identify the correlated satellites in the one-electron removal spectrum of the valence band of the two-dimensional Ising antiferromagnet K2CoF4. In addition, x-ray photoelectron spectra of the core levels, interpreted by a configuration-interaction impurity-cluster model, are reported. The estimated charge transfer Delta and the Mott-Hubbard U charge fluctuations pose K2CoF4 in the Mott-Hubbard region of the Zaanen-Sawatzky-Allen diagram. The values of Delta and U are also used to estimate the superexchange parameter J by considering a metal-ligand-metal three-center model. The results for K2CoF4 are compared to those obtained for CoO and the effect of Delta on the photoemission spectral features and on the magnitude of J are discussed.
引用
收藏
页码:10175 / 10182
页数:8
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