Strongly Correlated Impurity Band Superconductivity in Diamond: X-ray Spectroscopic evidence for upper Hubbard and mid-gap bands

Details Strongly Correlated Impurity Band Superconductivity in Diamond: X-ray Spectroscopic evidence for upper Hubbard and mid-gap bands Strongly Correlated Impurity Band Superconductivity in Diamond: X-ray Spectroscopic evidence for upper Hubbard and mid-gap bands

2004-10-12

arxiv.org/abs/cond-mat/0410296v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, LaTex, 3 figure files

Scientific paper

In a recent X-ray absorption study in boron doped diamond, Nakamura et al. have seen a well isolated narrow boron impurity band in non-superconducting samples and an additional narrow band at the chemical potential in a superconducting sample. We interpret the beautiful spectra as evidence for upper Hubbard band of a Mott insulating impurity band and an additional metallic `mid-gap band' of a conducting `self-doped' Mott insulator. This supports the basic framework of a recent theory of the present author of strongly correlated impurity band superconductivity (SCIBS) in a template of a wide-gap insulator, with no direct involvement of valence band states.

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