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Browsing by Author "Geohegan, David B."

Now showing 1 - 2 of 2
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    Investigation of Gd3N@C-2n (40 < n < 44) family by Raman and inelastic electron tunneling spectroscopy
    Burke, Brian G.; Chan, Jack; Williams, Keith A.; Ge, Jiechao C.; Shu, Chunying Y.; Fu, Wujun J.; Dorn, Harry C.; Kushmerick, James G. G.; Puretzky, Alexander A.; Geohegan, David B. (American Physical Society, 2010-03)
    The structure and vibrational spectrum of Gd3N@C-80 is studied through Raman and inelastic electron tunneling spectroscopy as well as density-functional theory and universal force field calculations. Hindered rotations, shown by both theory and experiment, indicate the formation of a Gd3N-C-80 bond which reduces the ideal icosahedral symmetry of the C-80 cage. The vibrational modes involving the movement of the encapsulated species are a fingerprint of the interaction between the fullerene cage and the core complex. We present Raman data for the Gd3N@C-2n (40 < n < 44) family as well as Y3N@C-80, Lu3N@C-80, and Y3N@C-88 for comparison. Conductance measurements have been performed on Gd3N@C-80 and reveal a Kondo effect similar to that observed in C-60.
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    Vibrational spectrum of the endohedral Y2C2@C-92 fullerene by Raman spectroscopy: Evidence for tunneling of the diatomic C-2 molecule
    Burke, Brian G.; Chan, Jack; Williams, Keith A.; Fuhrer, Timothy; Fu, Wujun J.; Dorn, Harry C.; Puretzky, Alexander A.; Geohegan, David B. (American Physical Society, 2011-03)
    The structure and vibrational spectrum of the novel endohedral fullerene Y2C2@C-92 was studied by Raman spectroscopy, with particular emphasis on the rotational transitions of the diatomic C-2 unit in the low-energy Raman spectrum. We report evidence for tunneling of this unit through the C-2 rotation plane and observe anomalous narrowing in a hindered rotational mode. We also report complementary density functional theory calculations that support our conclusions and discuss potential applications to quantum computing and nonvolatile memory devices.