Abstract
We report the first angle resolved photoemission spectroscopy (ARPES) study of single crystals of a borocarbide superconductor. In the normal state, there is clear evidence of dispersion within the manifold of Ni 3d features between ~ 1 and 3 eV binding energy. Dispersive features were also observed within ~ 1 eV of the Fermi level ( E F ) near the Γ and Z points of the bulk Brillouin zone. Resonant photoemission indicates partial Ni character for these states. An E F crossing occurs at a k-space position that is consistent with a predicted hole pocket centered on the G 1 point of the reciprocal lattice. In the photon energy range used (17–200 eV), symmetry points in multiple Brillouin zones were consistently located assuming a free electron final state.
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