Carbon Isotope Effect in Single-Crystal Rb{sub 3}C{sub 60}
- Department of Physics, University of California at Berkeley, Berkeley, California 94720 and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- The Department of Physics, 104 Davey Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-6300 (United States)
The sharp resistive transitions in superconducting single crystals of natural abundance and 99{percent} {sup 13}C -enriched Rb{sub 3}C {sub 60} reveal the carbon isotope effect with unprecedented accuracy. The measured isotope exponent {alpha}{sub C} =0.21{plus_minus}0.012 is outside the error bars of all previous reported values. Our precise value for {alpha}{sub C} , combined with T{sub c} , {alpha}{sub Rb} , and an {ital ab initio} calculation of the frequency distribution of the electron-phonon coupling, allows a fully constrained determination of the coupling strength {lambda}=0.9{sup +0.15}{sub {minus}0.1} and the Coulomb repulsion {mu}{sup *}=0.22{sup +0.03}{sub {minus}0.02} . These new measurements reveal a phonon-mediated superconductor with moderate coupling to a wide range of phonons centered near {approximately}1400 K . {copyright} {ital 1999} {ital The American Physical Society}
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 355462
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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