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American Physical Society, Physical Review B (Condensed Matter), 13(64), 2001

DOI: 10.1103/physrevb.64.132504

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Soft x-ray spectroscopy measurements of the p-like density of states of B in MgB2 and evidence for surface boron oxides on exposed surfaces

Journal article published in 2001 by T. A. Callcott, Callcott Ta, L. Lin, G. T. Woods, G. P. Zhang, Lin; G T. Woods; Zhang G P. T. A. Callcott; Lin, J. R. Thompson, M. Paranthaman ORCID, D. L. Ederer, J. R. Thompson; M Paranthaman; D L. Ederer
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Abstract

Soft X-ray absorption and fluorescence measurements are reported for the K-edge of B in MgB2. The measurements confirm a high density of B pxy(sigma)-states at the Fermi edge and extending to approximately 0.9 eV above the edge. A strong resonance is observed in elastic scattering through a core-exciton derived from out-of-plane pz(pi*)-states. Another strong resonance, observed in both elastic and inelastic spectra, is identified as a product of surface boron oxides. ; Comment: 7 pages total, 4 figures, submitted to Phys. Rev. Lett