Electronic structure of MgB$_2$: X-ray emission and absorption studies
cond-mat.supr-con
/ Authors
E. Z. Kurmaev, I. I. Lyakhovskaya, J. Kortus, A. Moewes, N. Miyata, M. Demeter, M. Neumann, M. Yanagihara, M. Watanabe, T. Muranaka
and 1 more author
/ Abstract
Measurements of x-ray emission and absorption spectra of the constituents of MgB$_2$ are presented. The results obtained are in good agreement with calculated x-ray spectra, with dipole matrix elements taken into account. The comparison of x-ray emission spectra of graphite, AlB$_2$, and MgB$_2$ in the binding energy scale supports the idea of charge transfer from $σ$ to $π$ bands, which creates holes at the top of the bonding $σ$ bands and drives the high-T$_c$