Title: Charge-spin susceptibility as a useful probe of electronic correlations in quantum materials

Abstract: We estimate the coupling between charge and spin degrees of freedom in a set of materials using the charge-spin susceptibility. This easily computable quantity measures the response of the charge density to changes in the spin density of a material. We look at a collection of ~40 layered strongly correlated or potentially strongly correlated materials. We find that those that show a sizable charge-spin susceptibility, in general present non-trivial ground states in their phase diagram: high-temperature unconventional superconductivity in the cuprates and iron-based superconductors and disordered magnetic ground states in materials like BaCo2As2.