Carbon Isotope Effect in Single-Crystal Rb3C60

M. S. Fuhrer; K. Cherrey; A. Zettl; Marvin L. Cohen; Vincent H. Crespi

doi:10.1103/PhysRevLett.83.404

Carbon Isotope Effect in Single-Crystal Rb₃C₆₀

M. S. Fuhrer, K. Cherrey, A. Zettl, Marvin L. Cohen, Vincent H. Crespi

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

The sharp resistive transitions in superconducting single crystals of natural abundance and 99% ¹³C-enriched Rb₃C₆₀ reveal the carbon isotope effect with unprecedented accuracy. The measured isotope exponent α_C=0.21±0.012 is outside the error bars of all previous reported values. Our precise value for α_C, combined with T_c, α_Rb, and an ab initio calculation of the frequency distribution of the electron-phonon coupling, allows a fully constrained determination of the coupling strength λ=0.9^+0.15_−0.1 and the Coulomb repulsion μ^∗=0.22^+0.03_−0.02. These new measurements reveal a phonon-mediated superconductor with moderate coupling to a wide range of phonons centered near ∼1400K.

Original language	English (US)
Pages (from-to)	404-407
Number of pages	4
Journal	Physical review letters
Volume	83
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.83.404
State	Published - Jan 1 1999

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.83.404

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title = "Carbon Isotope Effect in Single-Crystal Rb3C60",

abstract = "The sharp resistive transitions in superconducting single crystals of natural abundance and 99% 13C-enriched Rb3C60 reveal the carbon isotope effect with unprecedented accuracy. The measured isotope exponent αC=0.21±0.012 is outside the error bars of all previous reported values. Our precise value for αC, combined with Tc, αRb, and an ab initio calculation of the frequency distribution of the electron-phonon coupling, allows a fully constrained determination of the coupling strength λ=0.9+0.15−0.1 and the Coulomb repulsion μ∗=0.22+0.03−0.02. These new measurements reveal a phonon-mediated superconductor with moderate coupling to a wide range of phonons centered near ∼1400K.",

author = "Fuhrer, {M. S.} and K. Cherrey and A. Zettl and Cohen, {Marvin L.} and Crespi, {Vincent H.}",

note = "Funding Information: We would like to thank Vincent H. Crespi and Marvin L. Cohen for theoretical calculations in this work. This work was supported by DOE contract DE-AC03-76F00098 and NSF grant DMR-9501156.",

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T1 - Carbon Isotope Effect in Single-Crystal Rb3C60

AU - Fuhrer, M. S.

AU - Cherrey, K.

AU - Zettl, A.

AU - Cohen, Marvin L.

AU - Crespi, Vincent H.

N1 - Funding Information: We would like to thank Vincent H. Crespi and Marvin L. Cohen for theoretical calculations in this work. This work was supported by DOE contract DE-AC03-76F00098 and NSF grant DMR-9501156.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The sharp resistive transitions in superconducting single crystals of natural abundance and 99% 13C-enriched Rb3C60 reveal the carbon isotope effect with unprecedented accuracy. The measured isotope exponent αC=0.21±0.012 is outside the error bars of all previous reported values. Our precise value for αC, combined with Tc, αRb, and an ab initio calculation of the frequency distribution of the electron-phonon coupling, allows a fully constrained determination of the coupling strength λ=0.9+0.15−0.1 and the Coulomb repulsion μ∗=0.22+0.03−0.02. These new measurements reveal a phonon-mediated superconductor with moderate coupling to a wide range of phonons centered near ∼1400K.

AB - The sharp resistive transitions in superconducting single crystals of natural abundance and 99% 13C-enriched Rb3C60 reveal the carbon isotope effect with unprecedented accuracy. The measured isotope exponent αC=0.21±0.012 is outside the error bars of all previous reported values. Our precise value for αC, combined with Tc, αRb, and an ab initio calculation of the frequency distribution of the electron-phonon coupling, allows a fully constrained determination of the coupling strength λ=0.9+0.15−0.1 and the Coulomb repulsion μ∗=0.22+0.03−0.02. These new measurements reveal a phonon-mediated superconductor with moderate coupling to a wide range of phonons centered near ∼1400K.

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Carbon Isotope Effect in Single-Crystal Rb₃C₆₀

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