Filippo Troiani, Paolo Zanardi
Molecular nanomagnets are relatively complex spin systems that exhibit quantum mechanical behavior at low temperatures. Exploiting quantum-information theoretic measures we quantify the size of linear superpositions that can be generated within the ground multiplet of high-spin nanomagnets. In particular, we consider the prototypical single-molecule magnets (namely Mn$_{12}$ and Fe$_8$) and a physically significant class of spin rings (including Mn$_6$), all characterized by a ferrimagnetic spin ordering in the ground state. These cases are compared with those achievable in ferromagnetic spin clusters. We show that the size of these linear superpositions can be further enhanced by increasing the asymmetry between the sublattices, and by reducing the competition between exchange interactions within the nanomagnets.
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http://arxiv.org/abs/1304.7618
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