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Strongly correlated superconductivity.

M Capone1, M Fabrizio, C Castellani

  • 1Istituto Nazionale per la Fisica della Materia (INFM) Center for Statistical Mechanics and Complexity and Physics Department University of Rome "La Sapienza" Piazzale A. Moro, 2, I-00185, Rome, Italy. massimo.capone@roma1.infn.it

Science (New York, N.Y.)
|June 29, 2002
PubMed
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Strong electron correlations, typically hindering superconductivity, can surprisingly enhance it in doped Mott insulators like fullerenes and cuprates, especially near the Mott transition.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-temperature superconductivity in doped Mott insulators challenges conventional theories linking electron repulsion to suppressed superconductivity.
  • The recent discovery of superconductivity in doped fullerene C60 devices, despite strong electron correlations, presents a significant puzzle.

Purpose of the Study:

  • To investigate the role of strong electron correlations in superconductivity within doped fullerene models.
  • To determine if strong correlations can enhance superconductivity, particularly near the Mott transition.

Main Methods:

  • Utilizing a dynamical mean-field solution to model electron-doped fullerenes.
  • Analyzing the behavior of strongly correlated electron systems.

Main Results:

Related Experiment Videos

  • The dynamical mean-field solution demonstrates that strong correlations can enhance superconductivity in electron-doped fullerenes.
  • This enhancement is observed to be most significant close to the Mott transition.

Conclusions:

  • Strong electron correlations can be beneficial for superconductivity in certain materials, contrary to prior assumptions.
  • The identified mechanism may be applicable to other strongly correlated systems, including cuprate superconductors.