Physics of the Solid State
Anti-Jahn-Teller disproportionation and prospects for spin-triplet superconductivity in d-element compounds
Moskvin A. S.
1, Panov Yu. D.
1
1Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Email: alexander.moskvin@urfu.ru, yuri.panov@urfu.ru
We argue that the unusual properties of a wide class of materials based on Jahn-Teller 3d- and 4d-ions with different crystal and electronic structures, from quasi-two-dimensional unconventional superconductors (cuprates, nickelates, ferropnictides/chalcogenides, ruthenate Sr2RuO4), manganites with local superconductivity to 3D ferrates (CaSr)FeO3, nickelates RNiO3 and silver oxide AgO with unusual charge and magnetic order can be explained within a single scenario. The properties of these materials are related to the instability of their highly symmetric Jahn-Teller "progenitors" with the ground orbital E-state to charge transfer with anti-Jahn-Teller disproportionation and the formation of a system of effective local composite spin-singlet or spin-triplet, electronic or hole bosons moving in a non-magnetic or magnetic lattice. These unusual systems are characterized by an extremely rich variety of phase states from non-magnetic and magnetic insulators to unusual metallic and superconducting states. Keywords: Jahn-Teller effect, disproportionation, local composite bosons, spin-triplet superconductivity. DOI: 10.61011/PSS.2023.07.56394.37H
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