# Computation of the unifying thread in high temperature superconductors from first principles quantum Monte Carlo

## TL;DR

This paper uses high-precision quantum Monte Carlo calculations to identify a common spin-charge coupling feature in high-temperature superconductors, suggesting a unifying mechanism for their unconventional superconductivity.

## Contribution

It demonstrates that diffusion Monte Carlo can reveal a unifying spin-charge interaction in different high Tc superconductors, advancing understanding of their common origin.

## Key findings

- High accuracy DMC calculations show a cluster at intermediate spin-charge coupling.
- Spin-charge coupling may serve as a normal state marker.
- Unconventional superconductivity arises from charge-spin interactions.

## Abstract

It has long been a challenge to describe the origin of unconventional superconductivity. The two known examples with high Tc, based on iron and copper, have very different electronic structures, while other materials with similar electronic structure may not show superconductivity at all. In this paper, the authors show that by using high accuracy diffusion Monte Carlo calculations, the unconventional superconductors of both high Tc types form a cluster at intermediate spin-charge coupling. The spin-charge coupling may serve as a normal state marker for unconventional superconductivity, and provides evidence that unconventional superconductivity is due to interaction of charge with local spins in materials.