Optimized unconventional superconductivity in a molecular Jahn-Teller metal



Zadik, Ruth H, Takabayashi, Yasuhiro, Klupp, Gyoengyi, Colman, Ross H, Ganin, Alexey Y, Potocnik, Anton, Jeglic, Peter, Arcon, Denis, Matus, Peter, Kamaras, Katalin
et al (show 8 more authors) (2015) Optimized unconventional superconductivity in a molecular Jahn-Teller metal. SCIENCE ADVANCES, 1 (3). e1500059-.

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Abstract

Understanding the relationship between the superconducting, the neighboring insulating, and the normal metallic state above T c is a major challenge for all unconventional superconductors. The molecular A3C60 fulleride superconductors have a parent antiferromagnetic insulator in common with the atom-based cuprates, but here, the C60 (3-) electronic structure controls the geometry and spin state of the structural building unit via the on-molecule Jahn-Teller effect. We identify the Jahn-Teller metal as a fluctuating microscopically heterogeneous coexistence of both localized Jahn-Teller-active and itinerant electrons that connects the insulating and superconducting states of fullerides. The balance between these molecular and extended lattice features of the electrons at the Fermi level gives a dome-shaped variation of T c with interfulleride separation, demonstrating molecular electronic structure control of superconductivity.

Item Type: Article
Uncontrolled Keywords: Jahn-Teller effect, Metal-insulator transitions, Strong correlations, superconductivity
Depositing User: Symplectic Admin
Date Deposited: 01 Aug 2016 15:50
Last Modified: 19 Jan 2023 07:32
DOI: 10.1126/sciadv.1500059
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3002638