Photoemission study of weakly magnetic Y(Co1-xAlx)2

J. Y. Son, T. Konishi, Takashi Mizokawa, A. Fujimori, K. Koui, T. Goto

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Abstract

We have studied the electronic structure of Y(Co1-xAlx)2 with x=0.0, 0.12, and 0.18, which compositions cover the paramagnetic, metamagnetic, and ferromagnetic phases, by means of photoemission and inverse-photoemission spectroscopy. With Al substitution, broad peaks near the Fermi level (EF) are shifted upwards and one of them crosses EF as predicted by band-structure calculation, although the peaks are much broader than predicted by the calculation. The overall Co 3d band is narrow and has a high binding energy tail compared to the band-structure calculation, indicating significant electron correlation effects in the Co 3d band. In order to explain these observations, model self-energy corrections have been applied to the band density of states. The lower energy scale of the self-energy is found to lie in the same range as the characteristic temperature of the magnetic susceptibility.

Original languageEnglish
Pages (from-to)538-542
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number1
Publication statusPublished - 1999
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Son, J. Y., Konishi, T., Mizokawa, T., Fujimori, A., Koui, K., & Goto, T. (1999). Photoemission study of weakly magnetic Y(Co1-xAlx)2. Physical Review B - Condensed Matter and Materials Physics, 60(1), 538-542.