Datasets and Matlab code for figures included in the article
'Theory of potential impurity scattering in pressurized superconducting La3Ni2O7' from authors Steffen Bötzel, Frank Lechermann, Takasada Shibauchi and Ilya M. Eremin
and 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.
