Robust flat bands in RCo5 (R=rare earth) compounds

Abstract

The mechanism to realize the peculiar flat bands generally existing in RCo5 (R=rare earth) compounds is clarified by analyzing the first-principles band structures and the tight-binding model. These flat bands are constructed from the localized eigenstates, the existence of which is guaranteed by the partial cancelation between the intersite hopping amplitudes among the Co-3d states at the Kagome sites and those between the Kagome and honeycomb sites. Their relative positions to other bands can be controlled by varying the lattice parameters keeping their dispersion almost flat, which suggests the possibility of flat-band engineering.

6 pages, 5 figures

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Cited by in corpus (8)

• Quantum Theory of Rare-Earth Magnets
• Creating Weyl nodes and controlling their energy by magnetization rotation
• Rare-earth/transition-metal magnetic interactions in pristine and (Ni,Fe)-doped YCo5 and GdCo5
• Temperature and doping induced instabilities of the repulsive Hubbard model on Lieb lattice
• Archetypical "push the band critical point" mechanism for peaking of the density of states in three-dimensional crystals: Theory and case study of cubic H${}_3$S
• Methods for constructing parameter-dependent flat band lattices
• Hubbard models with nearly flat bands: Ground-state ferromagnetism driven by kinetic energy
• Analytical study of quasi-one dimensional flat band networks and slow light analogue