Tc vs carrier concentration in cubic fulleride superconductors

T. Yildirim, L. Barbedette, J.E. Fischer, C. L. Lin, J. Robert, P. Petit, T. T.M. Palstra

Research output: Contribution to journalArticleAcademicpeer-review

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The effect of carrier concentration on fulleride superconductivity is studied by x ray, Raman, magnetization, and ESR of two new cubic families: Na2CsxC60 (0<x<1) and M3-yBayC60 (0.2<y<2, M = K, Rb, or Cs). These are isostructural with known Pa3¯ and Fm3¯m trivalent superconductors, respectively, but with variable valence 2<n<5. Tc is peaked at or very near n = 3, decreasing rapidly in either direction to <0.5 K for n = 2.5 and 5. These results underscore the failure of both one-electron and strong correlation models to explain the dependence of Tc on band filling.

Original languageEnglish
Pages (from-to)167-170
Number of pages4
JournalPhysical review letters
Issue number1
Publication statusPublished - 1 Jan 1996
Externally publishedYes


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