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Giant diamagnetism of gold nanorods

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2014-07-30
Egilea
Hernando, A.
Ayuela Fernández, Andrés
Crespo, P.
Echenique Landiribar, Pedro Miguel
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New Journal of Physics 16 : (2014) // Article ID 073043
URI
http://hdl.handle.net/10810/16188
Laburpena
The presence of giant diamagnetism in Au nanorods, NRs, is shown to be a possible consequence of field induced currents in the surface electrons. The distance, Delta , between quantum surface energy levels has been calculated as a function of the NRs radius. Note that those electrons occupying states for which Delta > k(B)T are steadily orbiting with constant orbital moment. The diamagnetic response induced when a field is turned on remains constant during the time the field is acting. As the NRs radius increases, Delta decreases and accordingly the electron fraction available to generate constant currents decreases, consequently the surface diamagnetic susceptibility decreases towards its bulk value. The surface electronic motion induced by the axial applied field on electrons confined into a cylindrical surface accounts with extremely good quantitative agreement for the giant diamagnetism recently measured and reported.
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