Code and datasets for 'Theory of potential impurity scattering in pressurized superconducting La3Ni2O7'

Abstract:
Recently discovered high-Tc superconductivity in pressurized bilayer nickelate La3Ni2O7 (La-
327) is likely driven by the non-phononic repulsive interaction. Depending on the interlayer repul-
sion strength, the superconducting gap structure is expected to be either d-wave or sign-changing
bonding-antibonding s±-wave. Unfortunately, conventional spectroscopic probes of the gap struc-
ture are impractical due to the high-pressure requirement. We propose studying the effect of point-
like non-magnetic impurities to distinguish these symmetries, which can be achieved by electron
irradiation before applying pressure. Here, we theoretically predict conventional suppression for
d-wave superconductivity, whereas the suppression for the interlayer s±-wave state depends subtly
on the asymmetry of bonding and antibonding subspaces. For the predicted electronic structure
of La-327, the s±-wave is more robust, with Tc showing a convex-to-concave transition, indicating
a crossover to s++-wave symmetry as impurity concentration increases. We further analyze the
sensitivity of these findings to potential electronic structure modifications.