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Electronic structure of single-crystalline Mg(x)Al(1-x)B(2)

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arxiv cond-mat/0205230 v1 pith:3BKK6LF2 submitted 2002-05-10 cond-mat.supr-con

Electronic structure of single-crystalline Mg(x)Al(1-x)B(2)

classification cond-mat.supr-con
keywords structureelectronicsingle-crystallinesuperconductingabsorptionagreementanisotropicband
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Polarization-dependent x-ray absorption spectroscopy at the B 1s edge of single-crystalline Mg(x)Al(1-x)B(2) reveals a strongly anisotropic electronic structure near the Fermi energy. Comparing spectra for superconducting compounds (x=0.9, 1.0) with those for the non-superconductor x=0.0 gives direct evidence on the importance of an in-plane spectral feature crossing E_F for the superconducting properties of the diborides. Good agreement is found with the projected B 2p density of states from LDA band structure calculations.

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