Electronic structure of single-crystalline Mg(x)Al(1-x)B(2)
Schuppler, S. · Pellegrin, E. · Nuecker, N. · Mizokawa, T. · Merz, M. · Arena, D. A. · Dvorak, J. · Idzerda, Y. U. · Huang, D. -J. · Cheng, C. -F. · Bohnen, K. -P. · Heid, R. · Schweiss, P. · Wolf, Th.
Original · EN
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 EF 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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