Spin fluctuations sufficient to mediate superconductivity in nickelates

TL;DR

This paper demonstrates that spin fluctuations are sufficient to mediate high-temperature superconductivity in nickelates, supported by theoretical calculations and experimental data comparison.

Contribution

It provides the first cross-validation of spin-fluctuation strength in nickelates using both DΓA simulations and RIXS experiments, confirming the spin-fluctuation mediated pairing mechanism.

Findings

Good agreement between DΓA calculations and RIXS data.

Spin fluctuations are strong enough to mediate superconductivity.

Supports the spin-fluctuation pairing scenario in nickelates.

Abstract

Infinite-layer nickelates show high-temperature superconductivity, and the experimental phase diagram agrees well with the one simulated within the dynamical vertex approximation (D$\Gamma$A). Here, we compare the spin-fluctuation spectrum behind these calculations to resonant inelastic X-ray scattering experiments. The overall agreement is good. This independent cross-validation of the strength of spin fluctuations strongly supports the scenario, advanced by D$\Gamma$A, that spin-fluctuations are the mediator of the superconductivity observed in nickelates.