EPR test of the resonating-valence-bond theory of superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">K</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">n</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
F. MehranIBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598A. J. Schell-SorokinIBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598Charles A. BrownIBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598
1992lv
ABI
Abstract
EPR experiments on powder samples of ${\mathrm{C}}_{60}$${\mathrm{K}}_{\mathit{n}}$ are presented. The results contradict the basic assumption of a negative Hubbard U, which has been used to explain the superconductivity in fullerenes. The apparent orbital nondegeneracy of the observed state is explained in terms of a generalized dynamic Jahn-Teller effect.
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