Abstract

Molecular spintronics is usually based on paramagnetic or ferromagnetic ($S$ \ensuremath{\ne} 0) species. Here, the authors study small ensembles of two molecular antiferromagnets, {Mn${}_{4}$} and {Co${}_{4}$}, bound to carbon nanotube quantum dots. The current through the quantum dots shows a random telegraph signal caused by transitions between nondegenerate ${S}_{t\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}t}$ = 0 states of individual molecular antiferromagnets. Statistical analysis shows that transitions between those states are independent in the case of {Co${}_{4}$} ensembles, while {Mn${}_{4}$} ensembles display long-lived coherent superposition involving multiple complexes.

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