Predicting Unconventional High Temperature Superconductors in Trigonal Bipyramidal Coordinations

TL;DR

This paper proposes a new class of high-temperature superconducting candidates based on trigonal bipyramidal complexes with d^7 configuration, guided by principles unifying cuprates and iron-based superconductors.

Contribution

It introduces a novel design principle for high Tc superconductors involving trigonal bipyramidal complexes and predicts their pairing symmetry.

Findings

Identification of trigonal bipyramidal complexes as potential high Tc hosts

Prediction of d+id pairing symmetry in these materials

Guidance for experimental synthesis of new superconductors

Abstract

Cuprates and iron-based superconductors are two classes of unconventional high Tc superconductors based on 3d transition elements. Recently, two principles, correspondence principle and magnetic selective pairing rule, have been emerged to unify their high Tc superconducting mechanisms. These principles strongly regulate electronic structures that can host high Tc superconductivity. Guided by these principles, here we propose high Tc superconducting candidates that are formed by cation-anion trigonal bipyramidal complexes with a d^7 filling configuration on the cation ions. Their superconducting states are expected to be dominated by the d+id pairing symmetry.