Bistability of Free Cobalt and Iron Clusters

Details Bistability of Free Cobalt and Iron Clusters Bistability of Free Cobalt and Iron Clusters

2010-12-19

arxiv.org/abs/1012.4133v1

Phys. Rev. Lett. 107, 057203 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.057203

The cobalt and iron clusters CoN, FeN (20 < N < 150) measured in a cryogenic molecular beam are found to be bistable with magnetic moments per atom both {\mu}N/N 2{\mu}B in the ground states and {\mu}N */N {\mu}B in the metastable excited states (for iron clusters, {\mu}N ~3N{\mu}B and {\mu}N* N{\mu}B). This energy gap between the two states vanish for large clusters, which explains the rapid convergence of the magnetic moments to the bulk value and suggests that ground state for the bulk involves a superposition of the two, in line with the fluctuating local orders in the bulk itinerant ferromagnetism.

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