Quantum Interference Phenomena in the Local Polarization Dynamics of Mesoscopic Systems: An NMR Observation
Horacio M. Pastawski, Gonzalo Usaj, Patricia R. Levstein
Abstract
It was predicted that local spin polarization in a ring of five dipolar coupled spins should present a particular fingerprint of quantum interferences reflecting both the discrete and finite nature of the system [Phys. Rev. Lett. 75 (1995) 4310]. We report its observation for the proton system of a (C5H5)2Fe molecule using a rare 13C as local probe. Novel high frequency ( 60kHz) polarization oscillations appear because incomplete 13C-1H cross-polarization transfer splits the polarization state, in a portion that wanders in the proton system and one that remains in the 13 C. They interfere with each other after rejoining.
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