X-ray photoemission study of MgB

A. Santoni, U.B. Vetrella, G. Celentano, U. Gambardella, A. Mancini

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Abstract

Superconducting MgB2films were obtained by in-situ annealing of precursor multilayers deposited at low substrate temperature by sputtering from a MgB2stoichiometric target and by thermal evaporation of pure Mg. After an in-situ annealing at 500-600 °C, the films showed a zero resistance critical temperature up to 31 K. The as-obtained MgB2films were investigated by X-ray photoelectron spectroscopy (XPS) and X-ray auger electron spectroscopy (XAES). The electronic structure was studied by monitoring the B 1s, Mg 2p, O 1s core-levels and the Mg KL2L3Auger line. For comparison, the electronic structure of an MgB2commercial superconducting sputtering target, of a not-annealed precursor film and of a sample obtained by direct sputtering from the MgB2target have also been investigated. Electron spectroscopy showed that in the superconducting systems the Mg KL2L3Auger line kinetic energy position is always higher by about 0.9 eV with respect to the energy position of the same Auger line measured in the non-superconducting samples. © Springer-Verlag 2007.
Original languageEnglish
Pages (from-to)485 - 490
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume86
Issue number4
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Santoni, A., Vetrella, U. B., Celentano, G., Gambardella, U., & Mancini, A. (2007). X-ray photoemission study of MgB. Applied Physics A: Materials Science and Processing, 86(4), 485 - 490. https://doi.org/10.1007/s00339-006-3790-y