Article Dans Une Revue Synthetic Metals Année : 1993

Isotope effect on 82% 13C substituted K3C60

G. Quirion
  • Fonction : Auteur
D. Jerome
P. Bernier
  • Fonction : Auteur
S. Della-Negra
  • Fonction : Auteur
C. Fabre
  • Fonction : Auteur
A. Rassat
  • Fonction : Auteur

Résumé

In order to test the isotope effect in the superconducting doped fullerenes, we made the K3C60 compound in which the C60 molecules are enriched in 13C. The 13C concentration in C60 powder, as determined by mass spectrometry, was found to be 82%. A standard sample K3 12C60 was prepared in the same conditions. The superconducting transition was measured on both samples by an ac susceptibility technique. The onset transition temperature observed at Tc = 19.6±0.1K for the standard sample is lowered by 1.8K in the 13C compound which leads to α ≈ 1.45±0.3 in the usual BCS formula Tc ∼ M-α. From 13C NMR measurements of the relaxation time T1 on these two compounds, the isotopic shift leads to α ≈ 1.1±0.3 in a magnetic field of 9.4T, which remains strongly higher than the theoretical value α = 0.5.

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Dates et versions

hal-04944310 , version 1 (13-02-2025)

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Citer

P. Auban-Senzier, G. Quirion, D. Jerome, P. Bernier, S. Della-Negra, et al.. Isotope effect on 82% 13C substituted K3C60. Synthetic Metals, 1993, 56 (2-3), pp.3027-3032. ⟨10.1016/0379-6779(93)90074-7⟩. ⟨hal-04944310⟩
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