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Orbital-dependent electron correlation in double-layer nickelate LaNiO. | LitMetric
The latest discovery of high temperature superconductivity near 80 K in LaNiO under high pressure has attracted much attention. Many proposals are put forth to understand the origin of superconductivity. The determination of electronic structures is a prerequisite to establish theories to understand superconductivity in nickelates but is still lacking. Here we report our direct measurement of the electronic structures of LaNiO by high-resolution angle-resolved photoemission spectroscopy. The Fermi surface and band structures of LaNiO are observed and compared with the band structure calculations. Strong electron correlations are revealed which are orbital- and momentum-dependent. A flat band is formed from the Ni-3d orbitals around the zone corner which is ~ 50 meV below the Fermi level and exhibits the strongest electron correlation. In many theoretical proposals, this band is expected to play the dominant role in generating superconductivity in LaNiO. Our observations provide key experimental information to understand the electronic structure and origin of high temperature superconductivity in LaNiO.
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