Abstract
High-temperature superconductivity in doped Mott insulator cuprates denies the conventional belief that electron repulsion is detrimental to superconductivity. We discuss a parallel situation in the alkali fullerides which, even if lacking the cuprate’s spectacular T c ’s, are no lesser puzzle. The repulsive electron correlations in fullerides are of comparable strength to the cuprates: yet trivalent fullerides superconduct, and that with an s-wave order parameter. We discuss theoretical studies of a model for alkali fullerides which reveals, in presence of a weak pairing attraction (here of Jahn Teller origin), an unsuspected superconducting pocket near the Mott insulating state. The peculiar pairing mechanism in this model shows that close to an ideal, singlet Mott state, superconducting pairing can manage not just to avoid frustration by strong electron-electron repulsion, but actually to take vast advantage from it. Although derived by solving a very specific tetravalent fullende model, we argue that this mechanism is in fact common to a wider class of strongly correlated models, including those proposed for cuprates (1).
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References
Based on lectures presented at Hvar, and at Varenna (2002).
A. Kaminski et al., Phys. Rev. Lett. 84, 1788 (2000).
P. W. Anderson, Science 235, 1196 (1987).
G. Kotliar and J. Liu, Phys. Rev. B 38, 5142 (1988).
S. Sorella et al., Phys. Rev. Lett. 88, 117002 (2002).
A. Paramehanti, M. Randeria, and N. Trivedi, Phys. Rev. Lett. 87, 217002 (2001).
O. Gunnarsson, Rev. Mod. Phys. 69, 575 (1997).
R.L. Martin and J.P. Ritchie, Phys. Rev. B 48 4845 (1993)
R.W. Lof, M.A. van Veenendaal, B. Koopmans, H.T. Jankman, G.A. Sawatzky, Phys. Rev. Lett. 68, 3924 (1992).
N. Manini, E. Tosatti, and A. Auerbach, Phys. Rev. B 49, 13008 (1994)
O. Zhou et al., Science 255, 833 (1992).
T.T.M. Palstra et al., Solid State Commun. 93, 327 (1995).
N. Manini, G.E. Santoro, A. Dal Corso, and E. Tosatti, Phys. Rev. B 66, 115107 (2002)
O. Zhou et al., Phys. Rev. B 52, 483 (1995); S. Margadonna, K. Prassides, H. Simoda, Y. Iwasa, and M. Mezouar, Europhys. Lett. 56, 61 (2001).
V. Brouet, H. Alloul, T.N. Le, S. Garaj, and L. Forro, Phys. Rev. Lett. 86, 4680 (2001).
R. Kerkoud et al., J. Phys. Chem. Solids 57, 143 (1996).
M. Capone, M. Fabrizio, P. Giannozzi, and E. Tosatti, Phys. Rev. B 62, 7619 (2000).
C.A. Kuntscher, G.M. Bendele, P.W. Stephens, Phys. Rev. B 55, R3366 (1997).
G. Zimmer et al., in Physics and Chemistry of Fullerenes and Derivatives, edited by H. Kuzmany, O. Fink, M. Mehring, and S. Roth (World Scientific, Singapore, 1995).
M. Capone, M. Fabrizio, and E. Tosatti, Phys. Rev. Lett. 86, 5361 (2001); M. Capone, M. Fabrizio, C. Castellani, and E. Tosatti, Science 269, 2364 (2002).
M. Lueders et. al., Phil. Mag. B 82, 1611 (2002).
A. Georges, G. Kotliar, W. Krauth, and M.J. Rozenberg, Rev. Mod. Phys. 68, 13 (1996).
M. Fabrizio and E. Tosatti, Phys. Rev. B 55, 13465 (1997).
R. Micnas, J. Ranninger, and S. Robaszkiewicz, Rev. Mod. Phys. 62, 113 (1990).
P. Nozières, private communication and preprint (2002, to appear in Jour, of Stat. Phys.).
G. Kotliar, Eur. Phys. J. B 11, 27 (1999), and references therein.
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Fabrizio, M., Tosatti, E., Capone, M., Castellani, C. (2003). Enhancement of Superconductivity by Strong Correlations: A Model Study. In: Hewson, A.C., Zlatić, V. (eds) Concepts in Electron Correlation. NATO Science Series, vol 110. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0213-4_10
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DOI: https://doi.org/10.1007/978-94-010-0213-4_10
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