X-ray Photoemission Study of MgB2

Abstract

A c-axis oriented thin film and a high density sintered pellet of MgB2 have been studied by x-ray photoemission spectroscopy, and compared to measurements from MgO and MgF2 single crystals. The as-grown surface has a layer which is Mg-rich and oxidized, which is effectively removed by a nonaqueous etchant. The subsurface region of the pellet is Mg-deficient. This nonideal near-surface region may explain varied scanning tunneling spectroscopy results. The MgB2 core level and Auger signals are similar to measurements from metallic Mg and transition metal diborides, and the measured valence band is consistent with the calculated density of states.

19 pages, 6 figures; Submitted to Phys. Rev. B; added references and new data on films

References in corpus (10)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity of MgB2: Covalent Bonds Driven Metallic
• MgB2 superconducting thin films with a transition temperature of 39 Kelvin
• Scanning Tunneling Spectroscopy in MgB2
• Electronic structure of superconducting MgB2 and related binary and ternary borides
• Tunneling spectroscopy in small grains of superconducting MgB2
• Hole Superconductivity in $Mg{B}_2$: a high $T_c$ cuprate without Cu
• Energy Gap from Tunneling and Metallic Sharvin Contacts onto MgB2: Evidence for a Weakened Surface Layer
• Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2

Cited by in corpus (9)

• Spectroscopic Evidence for Anisotropic S-Wave Pairing Symmetry in MgB2
• Electronic structure of MgB${}_2$: X-ray emission and absorption studies
• Effects of unreacted Mg impurities on the transport properties of MgB2
• X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB2+x
• Ultrafast charge transfer processes accompanying KLL Auger decay in aqueous KCl solution
• Synthesis and photoemission study of as-grown superconducting MgB2 thin films
• Strong charge transfer effects in the Mg2p^{-1} core-level spectrum of MgB_2
• Resonant inelastic x-ray scattering (RIXS) spectra of magnesium diboride
• Electroplating of superconducting films of MgB2 from molten salts