Isotopic disorder in superconducting fullerenes

The superconducting transition temperature of doped fullerenes appears to be unusually sensitive to [ital partial] substitution of [sup 13]C for the naturally abundant isotope [sup 12]C. We show that the electron-phonon coupling constant [lambda] is generically independent of isotopic disorder. By s...

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Bibliographic Details
Published in:Physical review. B, Condensed matter Condensed matter, 1993-08, Vol.48 (6), p.4114-4118
Main Authors: DEAVEN, D. M, ROKHSAR, D. S
Format: Article
Language:English
Subjects:
665410 - Superconductivity- (1992-)
CARBON
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
Exact sciences and technology
FULLERENES
Fullerenes and related materials
ISOTOPE EFFECTS
MATERIALS
MIGDAL THEORY
NONMETALS
Phonons
PHYSICAL PROPERTIES
Physics
Properties of type I and type II superconductors
Superconducting materials (excluding high-tc compounds)
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
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Summary:The superconducting transition temperature of doped fullerenes appears to be unusually sensitive to [ital partial] substitution of [sup 13]C for the naturally abundant isotope [sup 12]C. We show that the electron-phonon coupling constant [lambda] is generically independent of isotopic disorder. By studying the effects of isotopic substitution on phonon-mediated superconductivity in C[sub 60] within the Migdal-Eliashberg theory we conclude that the theoretical superconducting transition temperature [ital T][sub [ital c]] does [ital not] show any anomalous dependence on isotopic substitution in weak or strong coupling. We comment on the possible causes of the experimentally observed effect.
ISSN:0163-1829
1095-3795
DOI:10.1103/PhysRevB.48.4114