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

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

2002-09-04

arxiv.org/abs/cond-mat/0209077v1

Physics

Condensed Matter

Superconductivity

12 pages, 4 figures

Scientific paper

10.1103/PhysRevB.66.172507

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.

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