What does this research mean for the field?

Superconductivity in Jahn–Teller magnets is primarily due to intrinsic charge instability related to anti-Jahn–Teller disproportionation, rather than the Jahn–Teller effect itself. Novelty: ClaimNovelty.SYNTHESIS. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

The aim is to explore the superconductivity of Jahn-Teller magnets and propose new mechanisms beyond traditional theories.

February 27, 2026

Superconductivity of Jahn–Teller Magnets

Key Points

The aim is to explore the superconductivity of Jahn-Teller magnets and propose new mechanisms beyond traditional theories.
Review of existing literature on high-temperature superconductivity and Jahn-Teller magnets.
Discussion of the intrinsic charge instability related to anti-JT disproportionation.
Introduction of a charged triplet method for describing electronic and magnetic structures.
Superconductivity in Jahn-Teller magnets is linked to intrinsic charge instability, not the Jahn-Teller effect.
Models indicate that 3d and 4d ions in various superconducting materials exhibit unique behavior.
Original methods for analyzing electronic structures expand beyond conventional models like the Hubbard model.

Abstract

The search for new oxide superconductors that has been undertaken by Bednorz and Müller and culminated in the discovery of high-temperature superconductivity (HTSC) in cuprates, has been based on the idea of creating conducting oxides containing Jahn–Teller (JT) ions, which are characterized by strong electron–lattice coupling with the formation of polarons and bipolarons. This idea is not currently considered among the leading mechanisms of HTSC. However, almost all HTSC or similar exotic superconducting materials based on 3d or 4d ions known today are JT magnets (cuprates La2CuO4, nickelates such as RNiO2 and La3Ni2O7, ferropnictides/chalcogenides, Sr2RuO4, and RuO2). Unlike the idea of Bednorz and Müller, we believe that the superconductivity of Jahn–Teller magnets is not related to the Jahn–Teller effect, but it is due to their intrinsic charge instability with respect to so-called anti-JT disproportionation. In this review, an original method of charged triplets for describing the electronic and magnetic structure of JT magnets beyond the Hubbard model and density functional theory with examples of phase diagram modeling has been discussed.

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