Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-12
Physics
Condensed Matter
Strongly Correlated Electrons
submitted to SCES 2001, two-columnn format, modified text
Scientific paper
10.1016/S0921-4526(01)01202-9
Bulk-sensitive high-resolution Ce 4f spectra have been obtained from 3d $\to$ 4f resonance photoemission measurements on La$_{1-x}$Ce$_x$Al$_2$ and La$_{1-x}$Ce$_x$Ru$_2$ for $x = 0.0, 0.04, 1.0$. The 4f spectra of low-Kondo-temperature ($T_{K}$) (La,Ce)Al$_2$ are essentially identical except for a slight increase of the Kondo peak with $x$, which is consistent with a known increase of $T_{K}$ with $x$. In contrast, the 4f spectra of high-$T_{K}$ (La,Ce)Ru$_2$ show a Kondo-like peak and also a 0.5 eV structure which increases strongly with $x$. The resonance photon-energy dependences of the two contributions are different and the origin of the 0.5 eV structure is still uncertain.
Allen John William
Frederick N. A.
Freeman E. J.
Kadono K.
Kim Hae-Dong
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