Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-02-17
Phys. Rev. B 77, 184410 (2008).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures, submitted to Phys. Rev. Lett
Scientific paper
We present a microscopic theory of single molecule magnets. From our exact single-ion spin matrix elements for four arbitrary spins, we study the single-ion anisotropy of equal spins exhibiting $T_d$, $D_{2d}$, or $C_{4v}$ molecular group symmetry. Each group generates site-dependent single-ion anisotropy. For weak anisotropy, accurate Hartree expressions for the magnetization, specific heat, electron paramagnetic resonance (EPR) absorption, and inelastic neutron scattering cross-section are given. For $D_{2d}$, azimuthal single-ion anisotropy leads to the observed Ni$_4$ EPR splittings.
Efremov Dmitri V.
Klemm Richard A.
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