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Hubbard splitting and electron correlation in the ferromagnetic metal CrO 2

1997; American Physical Society; Volume: 56; Issue: 24 Linguagem: Inglês

10.1103/physrevb.56.r15509

1095-3795

Toshiyuki Tsujioka, T. Mizokawa, J. Okamoto, A. Fujimori, M. Nohara, H. Takagi, Kazunari Yamaura, M. Takano,

2D Materials and Applications

We have studied the electronic structure of ${\mathrm{CrO}}_{2}$ by photoemission spectroscopy and specific heat measurements. The Cr $3d$ band shows a splitting into the upper and lower Hubbard bands with a small but finite density of states at the Fermi level, consistent with its metallic behavior. The small renormalization factor $(z\ensuremath{\sim}0.1\ensuremath{\ll}1)$ signifies strong electron correlation, but is still large compared with many $3d$ transition-metal oxides.