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

T. A. Callcott (1) , L. Lin (1) , G. T. Woods (1) , G. P. Zhang (1) , J. R. Thompson(1 , 2) , M. Paranthaman(2) , D. L. Ederer(3) ((1) The University of Tennessee

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Knoxville TN (2) Oak Ridge National Laboratory Oak Ridge (3) Tulane University New Orleans LA)

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classification ❄️ cond-mat.supr-con

keywords measurementsstatesborondensityedgeelasticmgb2observed

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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.

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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

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