Optical absorption of transition-metal island films: Correlation interaction between conduction electrons of transition metals
著者
安濃, 英治
(Anno, Eiji)
Tanimoto, M
上位タイトル
JOURNAL OF APPLIED PHYSICS
Vol.88,
No.6
(2000.
9)
,p.3426-
3432
識別番号
ISSN
0021-8979
抄録
Optical plasma-resonance absorption of Pt island films consisting of Pt particles larger than about 25 A in diameter has been measured in the photon energy range of 0.5-6.5 eV. As in Rh and Pd island films reported previously, the broadening of the optical plasma-resonance absorption reflects a correlation interaction between conduction electrons. Comparison of the broadening for the Pt island films with that for the Rh island films shows that the correlation interaction is strong when the conduction-electron density n is low. In an electron-gas model, the correlation interaction between electrons becomes stronger with lowering electron density, because the magnitude ratio of the Coulomb to kinetic energy increases as the electron density lowers. Thus, the strong correlation-interaction at low n proves that the correlation interaction in transition metals becomes stronger with magnitude ratio. The magnitude ratio in transition metals is pointed out to increase with lowering n and/or with strengthening d character of conduction electrons. Based on the correlation interaction, reflected by the broadening for the Pt, Rh, and Pd island films, and on the strong correlation interaction, found previously for Ir, the order of magnitude ratio is Ir>Pt>Pd>Rh.
注記
Copyright 2000 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Anno, E; Tanimoto, M, Journal of Applied Physics 88(6), 3426-3432 (2000) and may be found at http://link.aip.org/link/?jap/88/3426.
