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We have performed angle-resolved photoemission spectroscopy of Co-basedboride superconductor LaCo1.73Fe0.27B2 (Tc = 4.1 K), which is isostructural tothe 122-type Fe-pnictide superconductor with the pnictogen atom being replacedwith boron. We found that the Fermi level is located at a dip in the density ofstates (DOS) in contrast to Co-pnictide ferromagnets. This reduction in DOStogether with the strong Co 3d-B 2p covalent bonding removes the ferromagneticorder and may cause the superconductivity. The energy bands near the Fermilevel show higher three dimensionality and a weaker electron-correlation effectthan those of Fe pnictides. The Fermi surface topology is considerablydifferent from that of Fe pnictides, suggesting the difference in thesuperconducting mechanism between boride and pnictide superconductors.

Angle-resolved photoemission spectroscopy of Co-based boride superconductor LaCo1.73Fe0.27B2