Local antiferromagnetic exchange and collaborative Fermi surface as key ingredients of high temperature superconductors

TL;DR

This paper reveals that high-temperature superconductivity in cuprates, ferropnictides, and ferrochalcogenides is linked to local antiferromagnetic exchange interactions and Fermi surface topology, providing a guiding principle for discovering new superconductors.

Contribution

It establishes a direct connection between magnetic exchange interactions in parent compounds and the superconducting gap functions in their doped counterparts.

Findings

High Tc achieved when Fermi surface matches pairing symmetry form factor.

Magnetic exchange interactions directly influence superconducting gap functions.

Provides a principle for searching new high-temperature superconductors.

Abstract

Cuprates, ferropnictides and ferrochalcogenides are three classes of unconventional high-temperature superconductors, who share similar phase diagrams in which superconductivity develops after a magnetic order is suppressed, suggesting a strong interplay between superconductivity and magnetism, although the exact picture of this interplay remains elusive. Here we show that there is a direct bridge connecting antiferromagnetic exchange interactions determined in the parent compounds of these materials to the superconducting gap functions observed in the corresponding superconducting materials. High superconducting transition temperature is achieved when the Fermi surface topology matches the form factor of the pairing symmetry favored by local magnetic exchange interactions. Our result offers a principle guide to search for new high temperature superconductors.