High-temperature Superconductivity in Perovskite Hydride below 10 GPa

TL;DR

This study designs and identifies perovskite hydrides stable below 10 GPa that exhibit high-temperature superconductivity, advancing the potential for practical applications at manageable pressures.

Contribution

The paper introduces a series of stable low-pressure perovskite hydrides with high superconducting transition temperatures, expanding the scope of feasible high-temperature superconductors.

Findings

9 compounds stable within 20 GPa

5 compounds with Tc > 120 K within 10 GPa

Identification of stable perovskite hydrides at low pressures

Abstract

Hydrogen and hydrides materials have long been considered promising materials for high-temperature superconductivity. But the extreme pressures required for the metallization of hydrogen-based superconductors limit their applications. Here, we have designed a series of high-temperature perovskite hydrides that can be stable within 10 GPa. Our research covered 182 ternary systems and ultimately determined that 9 compounds were stable within 20 GPa, of which 5 exhibited superconducting transition temperatures exceeding 120 K within 10 GPa. Excitingly, KGaH3 and CsInH3 are thermodynamically stable at 50 GPa. Among these perovskite hydrides, alkali metals are responsible for providing a fixed amount of charge and maintaining structural stability, while the cubic framework formed by IIIA group elements and hydrogen is crucial for high-temperature superconductivity. This work will inspire further experimental exploration and take an important step in the exploration of low-pressure stable high-temperature superconductors.