XPS study of the electronic density of states in the superconducting Mo2B and Mo2BC compounds
作者： R. Escamilla , E. Carvajal , M. Cruz-Irisson , F. Morales , L. Huerta
DOI: 10.1007/S10853-016-9938-Z
关键词:
摘要: The electronic structure of the Mo\(_2\)BC and Mo\(_2\)B compounds was investigated by X-ray photoelectron spectroscopy. Mo 3d, C 1s, B 1s core levels are identified. For Mo\(_2\)BC, core-level binding energies corresponding to 3d\(_{5/2}\), localized at 227.90, 187.94, 282.95 eV, respectively, whereas for Mo\(_2\)B, 228.09 188.06 respectively. Core-level shifts observed in both using charge-potential model. density states calculated GGA approximation. Our results show that Fermi level is higher than Mo\(_2\)BC. dominance 4d down 8 eV below found. total DOS consistent with XPS valence band spectra. Finally, within BCS theory framework, presence superconductivity can not be explained only as a function level. electron-phonon coupling constant (\(\lambda \)) McMillan equation; obtained values were 0.75 Mo\(_{2}\)BC 0.70 Mo\(_{2}\)B. These indicate intermediate coupled superconductors.
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