Optimized unconventional superconductivity in a molecular Jahn-Teller metal

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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) , Kasahara, Yuichi, Iwasa, Yoshihiro, Fitch, Andrew N, Ohishi, Yasuo, Garbarino, Gaston, Kato, Kenichi, Rosseinsky, Matthew J ORCID: 0000-0002-1910-2483 and Prassides, Kosmas (2015) Optimized unconventional superconductivity in a molecular Jahn-Teller metal SCIENCE ADVANCES, 1 (3). e1500059-. ISSN 2375-2548, 2375-2548

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Abstract

Understanding the relationship between the superconducting, the neighboring insulating, and the normal metallic state above Tc 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 Tc 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:	16 Jun 2026 04:27
DOI:	10.1126/sciadv.1500059
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3002638
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