Abstract
Layered nickelates have the potential for exotic physics similar to high TC superconducting cuprates as they have similar crystal structures and these transition metals are neighbors in the periodic table. Here we present an angle-resolved photoemission spectroscopy (ARPES) study of the trilayer nickelate La4Ni3O10 revealing its electronic structure and correlations, finding strong resemblances to the cuprates as well as a few key differences. We find a large hole Fermi surface that closely resembles the Fermi surface of optimally hole-doped cuprates, including its d_{x^2-y^2} orbital character, hole filling level, and strength of electronic correlations. However, in contrast to cuprates, La4Ni3O10 has no pseudogap in the d_{x^2-y^2} band, while it has an extra band of principally d_{3z^2-r^2} orbital character, which presents a low temperature energy gap. These aspects drive the nickelate physics, with the differences from the cuprate electronic structure potentially shedding light on the origin of superconductivity in the cuprates.
Highlights
Layered nickelates have the potential for exotic physics similar to high TC superconducting cuprates as they have similar crystal structures and these transition metals are neighbors in the periodic table
Layered perovskite nickelates are perhaps the most natural place to look for this physics, as nickel lies directly adjacent to copper in the periodic table, meaning they should be charge-transfer/Mott insulators[2] and nickelates can be formed in the same or similar crystal structures as the cuprates[3]
We present the electronic structure and dynamics of trilayer La4Ni3O10 using angle-resolved photoemission spectroscopy (ARPES) and compare our observations on La4Ni3O10 to cuprates and to density functional theory (DFT) band structure calculations
Summary
In cuts 1 and 2 (Fig. 2c, d), which are the high symmetry cuts through the Fermi surface shown, we observe a sharp band dispersion near the M point corresponding to the cuprate-like hole pocket near the boundary of the unfolded Brillouin zone. This region in momentum space resembles the antinodal region in the holedoped cuprates, where the band structure comes to a saddle point at (π, 0) roughly around −100 meV, and hosts the largest energy gap in both the superconducting and pseudogap phases.
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