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Zadik RH, Takabayashi Y, Klupp G, et al. Optimized unconventional superconductivity in a molecular Jahn-Teller metal. Sci Adv. 2015;1(3):e1500059doi: 10.1126/sciadv.1500059.
Zadik, R. H., Takabayashi, Y., Klupp, G., Colman, R. H., Ganin, A. Y., Potočnik, A., Jeglič, P., Arčon, D., Matus, P., Kamarás, K., Kasahara, Y., Iwasa, Y., Fitch, A. N., Ohishi, Y., Garbarino, G., Kato, K., Rosseinsky, M. J., & Prassides, K. (2015). Optimized unconventional superconductivity in a molecular Jahn-Teller metal. Science advances, 1(3), e1500059. https://doi.org/10.1126/sciadv.1500059
Zadik, Ruth H, et al. "Optimized unconventional superconductivity in a molecular Jahn-Teller metal." Science advances vol. 1,3 (2015): e1500059. doi: https://doi.org/10.1126/sciadv.1500059
Zadik RH, Takabayashi Y, Klupp G, Colman RH, Ganin AY, Potočnik A, Jeglič P, Arčon D, Matus P, Kamarás K, Kasahara Y, Iwasa Y, Fitch AN, Ohishi Y, Garbarino G, Kato K, Rosseinsky MJ, Prassides K. Optimized unconventional superconductivity in a molecular Jahn-Teller metal. Sci Adv. 2015 Apr 17;1(3):e1500059. doi: 10.1126/sciadv.1500059. eCollection 2015 Apr. PMID: 26601168; PMCID: PMC4640631.
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Sci Adv. 2015 Apr 17;1(3):e1500059. doi: 10.1126/sciadv.1500059. eCollection 2015 Apr.

Optimized unconventional superconductivity in a molecular Jahn-Teller metal.

Science advances

Ruth H Zadik, Yasuhiro Takabayashi, Gyöngyi Klupp, Ross H Colman, Alexey Y Ganin, Anton Potočnik, Peter Jeglič, Denis Arčon, Péter Matus, Katalin Kamarás, Yuichi Kasahara, Yoshihiro Iwasa, Andrew N Fitch, Yasuo Ohishi, Gaston Garbarino, Kenichi Kato, Matthew J Rosseinsky, Kosmas Prassides

Affiliations

  1. Department of Chemistry, Durham University, Durham DH13LE, UK.
  2. Department of Chemistry, Durham University, Durham DH13LE, UK. ; Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
  3. Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK.
  4. Jozef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia.
  5. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, H-1525 Budapest, Hungary.
  6. Quantum-Phase Electronics Center and Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
  7. European Synchrotron Radiation Facility, 38043 Grenoble, France.
  8. Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan.
  9. RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
  10. Department of Chemistry, Durham University, Durham DH13LE, UK. ; World Premier International-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. ; Japan Science and Technology Agency, ERATO Isobe Degenerate ?-Integration Project, Tohoku University, Sendai 980-8577, Japan.

PMID: 26601168 PMCID: PMC4640631 DOI: 10.1126/sciadv.1500059

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.

Keywords: Jahn-Teller effect; Metal-insulator transitions; Strong correlations; superconductivity

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