Electronic Structure of B-2$pσ$ and $pπ$ States in MgB$_2$, AlB$_2$ and ZrB$_2$ Single Crystals

Details Electronic Structure of B-2$pσ$ and $pπ$ States in MgB$_2$, AlB$_2$ and ZrB$_2$ Single Crystals Electronic Structure of B-2$pσ$ and $pπ$ States in MgB$_2$, AlB$_2$ and ZrB$_2$ Single Crystals

2003-07-16

arxiv.org/abs/cond-mat/0307376v1

Physics

Condensed Matter

Superconductivity

to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.064515

The effect of electron correlation (EC) on the electronic structure in MgB$_2$, AlB$_2$ and ZrB$_2$, is studied by examining the partial density of states (PDOS) of B-2$p\sigma$ and $p\pi$ orbitals using the polarization dependence of x-ray emission and absorption spectra. The discrepancies between observed and calculated PDOSs cannot be attributed to EC effects. The present results suggest that the EC effect is less than the experimental error ($\sim$ 0.2 eV), which indirectly supports a scenario that electron-phonon interaction plays an essential role in the occurrence of superconductivity.

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