Experimental Observation of Superparamagnetism in Manganese Clusters

Mark B. Knickelbein
Phys. Rev. Lett. 86, 5255 – Published 4 June 2001
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Abstract

A molecular beam of manganese clusters, Mnn (n=1199), produced at 68 K is deflected toward high field by a gradient field magnet. These results indicate that Mnn clusters in this size range are superparamagnetic species whose intrinsic moments can be determined within the framework of the Langevin model of paramagnetism. Local minima in per-atom magnetic moments are observed for Mn13 and Mn19, suggestive of an icosahedral growth sequence for the smaller size range. For larger clusters, broad oscillations in the per-atom moments are observed, with a minimum near Mn3237 and a maximum around Mn5056.

  • Received 29 January 2001

DOI:https://doi.org/10.1103/PhysRevLett.86.5255

©2001 American Physical Society

Authors & Affiliations

Mark B. Knickelbein

  • Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439

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Vol. 86, Iss. 23 — 4 June 2001

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