Photoemission and x-ray absorption study of MgC_(1-x)Ni_3

Abstract

We investigated electronic structure of MgC_(1-x)Ni_3 with photoemission and x-ray absorption spectroscopy. Both results show that overall band structure is in reasonable agreement with band structure calculations including the existence of von Hove singularity (vHs)near E_F. However, we find that the sharp vHs peak theoretically predicted near the E_F is substantially suppressed. As for the Ni core level and absorption spectrum, there exist the satellites of Ni 2p which have a little larger energy separation and reduced intensity compared to the case of Ni-metal. These facts indicate that correlation effects among Ni 3d electrons may be important to understand various physical properties.

12 pages, 4 figures

References in corpus (6)

• Superconductivity Near Ferromagnetism in MgCNi3
• Electronic structures of antiperovskite superconductors: MgXNi${}_3$ (X=B,C,N)
• Effect of sintering temperature under high pressure in the uperconductivity for MgB2
• (13)C NMR investigation of the superconductor MgCNi_3 up to 800K
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• The Effect of Ru substitution for Ni on the superconductivity in MgCNi3-xRux
• Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements
• A first-principles comparison of the electronic properties of MgC_{y}Ni_{3} and ZnC_{y}Ni_{3} alloys
• Vacancies, disorder-induced smearing of the electronic structure, and its implications for the superconductivity of anti-perovskite MgC${}_{0.93}$Ni${}_{2.85}$
• Compositional disorder and its influence on the structural, electronic and magnetic properties of MgC(Ni_{1-x}Co_{x})_{3} alloys using first-principles