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Mechanism of superconductivity in a doped A(x)C60 fulleride.

[In Russian. / En russe.]

Author(s) : LOKTEV V. M., PASHICKIJ E. A.

Type of article: Article

Summary

It is shown that a high symmetry of both C60 molecules and cubic fcc lattice crystal formed by those molecules lies in the background of high-critical temperature superconductivity in solid fullerene C60 (fulleride) doped with alkali atoms and thallium. The first reason causes the dynamic Jahn-Teller effect with the electron-intramolecular C60 vibration coupling and the second one causes the multivalley conduction band structure and multiconnected Fermi surface for the stoichiometric composition of doped A(3)C60 (A = potassium, rubidium and cesium) fulleride. Both the factors lead to increasing the electron-phonon coupling constant and, as a result, to an enhanced critical temperature of the superconducting transition in A(3)C60 in contrast to solid hyperfullerides at a number higher or equal to 70 with the lower symmetry of molecules and crystal lattice.

Details

  • Original title: [In Russian. / En russe.]
  • Record ID : 1994-2092
  • Languages: Russian
  • Source: Z. eksp. teor. Fiz. - vol. 103 - n. 2
  • Publication date: 1993/02
  • Document available for consultation in the library of the IIR headquarters only.

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