Limitations of the Giant Spin Hamiltonian in Explaining Magnetization Tunneling in a Single-Molecule Magnet

A. Wilson; J. Lawrence; E-C. Yang; M. Nakano; D. N. Hendrickson; S. Hill

Limitations of the Giant Spin Hamiltonian in Explaining Magnetization Tunneling in a Single-Molecule Magnet

Mesoscale and Nanoscale Physics 2007-05-23 v1

Authors: A. Wilson , J. Lawrence , E-C. Yang , M. Nakano , D. N. Hendrickson , S. Hill

Abstract

EPR studies of a Ni4 single-molecule magnet yield the zero-field-splitting (zfs) parameters, D, B40 and B44, based on a giant spin approximation (GSA) with S = 4. Experiments on an isostructural Ni-doped Zn4 crystal establish the Ni(II) ion zfs parameters. The 4th-order zfs parameters in the GSA arise from the interplay between the Heisenberg interaction, Js1.s2, and the 2nd-order single-ion anisotropy, giving rise to mixing of higher lying states into the S = 4 state. Consequently, J directly influences the zfs in the ground state, enabling its direct determination by EPR.

Keywords

giant spin approximation single-molecule magnet magnetization tunneling zero-field splitting EPR Heisenberg interaction

Cite

@article{arxiv.cond-mat/0606252,
  title  = {Limitations of the Giant Spin Hamiltonian in Explaining Magnetization Tunneling in a Single-Molecule Magnet},
  author = {A. Wilson and J. Lawrence and E-C. Yang and M. Nakano and D. N. Hendrickson and S. Hill},
  journal= {arXiv preprint arXiv:cond-mat/0606252},
  year   = {2007}
}

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5 pages, including figures

Limitations of the Giant Spin Hamiltonian in Explaining Magnetization Tunneling in a Single-Molecule Magnet

Abstract

Keywords

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