Compressive strain in bilayer nickelates pushes the Ni dz2 bands away from the Fermi level and widens the orbital energy gap by about 50%, suggesting dz2 at the Fermi level is not essential for superconductivity.
Nature 572(7771), 624–627 (2019)
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Structural and Electronic Evolution of Bilayer Nickelates Under Biaxial Strain
Compressive strain in bilayer nickelates pushes the Ni dz2 bands away from the Fermi level and widens the orbital energy gap by about 50%, suggesting dz2 at the Fermi level is not essential for superconductivity.