Heisenberg Dimer Single Molecule Magnets in a Strong Magnetic Field

Details Heisenberg Dimer Single Molecule Magnets in a Strong Magnetic Field Heisenberg Dimer Single Molecule Magnets in a Strong Magnetic Field

2002-06-21

arxiv.org/abs/cond-mat/0206406v2

Phys. Rev. B 66, 174427 (2002).

Physics

Condensed Matter

Statistical Mechanics

11 pages, 14 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.174427

We calculate the static and dynamic properties of single crystal, single molecule magnets consisting of equal spin $S=1/2$ or 5/2 dimers. The spins in each dimer interact with each other via the Heisenberg exchange interaction and with the magnetic induction ${\bf B}$ via the Zeeman interaction, and interdimer interactions are negligible. For antiferromagnetic couplings, the static magnetization and specific heat exhibit interesting low temperature $T$ and strong ${\bf B}$ quantum effects. We calculate the frequency spectrum of the Fourier transform of the real part of the time autocorrelation function ${\cal C}_{11}(t)$ for arbitrary $T, {\bf B}$, and compare our results with those obtained for classical spins. We also calculate the inelastic neutron magnetic dynamical structure factor $S({\bf q},\omega)$ at arbitrary $T, {\bf B}$.

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