X-ray Photoemission Study of MgB2

Details X-ray Photoemission Study of MgB2 X-ray Photoemission Study of MgB2

2001-03-09

arxiv.org/abs/cond-mat/0103215v2

Phys. Rev. B 64, 052510 (2001)

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1103/PhysRevB.64.052510

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.

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