Highly unusual, doubly-strongly-correlated, altermagnetic, 3D analogue of parent compounds of high-Tc cuprates

TL;DR

This paper analyzes the electronic and magnetic properties of CuAg(SO4)2, a novel strongly correlated material that differs from cuprates and exhibits potential for exploring superconductivity and altermagnetism.

Contribution

It provides a detailed analysis of CuAg(SO4)2, revealing its unique properties and potential as a new platform for studying superconductivity and altermagnetism in strongly correlated systems.

Findings

CuAg(SO4)2 has distinct electronic and magnetic properties from cuprates.

The material exhibits features relevant to altermagnetism.

It opens new avenues for research in superconductivity and magnetism.

Abstract

Discovery of high-temperature superconductivity (HTSC) in strongly correlated cuprates opened a new chapter in condensed matter physics, breaking existing stereotypes of what is a material base for a good superconductor ("Matthias rules"), at the same time emphasizing richness and challenge of strongly correlated physics, personified by the most strongly correlated 3d ion, Cu2+. A recently reported new compound, CuAg(SO4)2, combines in a fascinating way the same ion with the most strongly correlated 4d one, Ag2+. In this Letter, we present a detailed analysis of electronic and magnetic properties of this material, and show that it is very different from the HTSC cuprates in several different ways, and opens a door into further research of superconductivity and magnetism, in particular altermagnetism, in strongly correlated materials.