Single-Band versus Two-Band Description of Magnetism in Infinite-Layer Nickelates

Abstract

We present a weak-coupling analysis of magnetism in infinite-layer nickelates, where we compare a single-band description with a two-band model. Both models predict that (i) hybridization due to hopping is negligible, and (ii) the magnetic properties are characterized by very similar dynamic structure factors, S(k→,ω), at the points (π,π,0) and (π,π,π). This gives effectively a two-dimensional description of the magnetic properties.

Keywords

• high-<i>T_c</i> superconductivity
• antiferromagnetism
• Mott insulator
• entanglement
• degenerate Hubbard model
• multiband model