Electronic structure of MgB$_2$ from angle-resolved photoemission spectroscopy

Details Electronic structure of MgB$_2$ from angle-resolved photoemission spectroscopy Electronic structure of MgB$_2$ from angle-resolved photoemission spectroscopy

2001-11-09

arxiv.org/abs/cond-mat/0111152v1

Phys. Rev. Lett. 88, 157002 (2002)

Physics

Condensed Matter

Superconductivity

Revtex 3 pages, 3 JPEG figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.88.157002

The first angle-resolved photoemission spectroscopy results from MgB$_2$ single crystals are reported. Close to the $\Gamma$K and $\Gamma$M directions, three distinct dispersions are observed approaching the Fermi energy, as can be assigned to the theoretically predicted $\sigma$ (B $2p_{x,y}$) and $\pi$ (B $2p_z$) bands. In addition, we also observed a small parabolic-like band centered around $\Gamma$, and attributed it to a surface-derived state. Good agreement between our results and the band calculations suggests that the electronic structure of MgB$_2$ is of a conventional nature, thus implying that electron correlations are weak, and may be of little importance to the superconductivity in this system.

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