Rare-Earth Tuned Superconductivity
Tuning the rare-earth ion radius switches the electronic structure and magnetic correlations from quasi-2D to 3D within the same nickelate family, offering a structural lever for tailoring superconductivity.
Zhang, Yajun · Zhang, Jingtong · He, Xu · Wang, Jie · Ghosez, Philippe
PNAS Nexus 2023
Systems with large rare-earth ions (La, Pr) exhibit quasi-2D antiferromagnetic correlations and localized dx2-y2 orbitals near the Fermi level
Systems with small rare-earth ions (Nd-Lu) exhibit 3D magnetic dimensionality and strong kz dispersion of d3z2-r2 electrons at the Fermi level
Nd-Lu systems undergo a structural transition with oxygen rotation motion on cooling