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Heisenberg Dimer Single Molecule Magnets in a Strong Magnetic Field | | Dmitri V. Efremov
; Richard A. Klemm
; | | Date: |
21 Jun 2002 | | Journal: | Phys. Rev. B 66, 174427 (2002). | | Subject: | Statistical Mechanics; Mesoscopic Systems and Quantum Hall Effect | cond-mat.stat-mech cond-mat.mes-hall | | Abstract: | 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 ${f B}$ 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 ${f B}$ 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 $T, {f B}$, and compare our results with those obtained for classical spins. We also calculate the inelastic neutron magnetic dynamical structure factor $S({f q},omega)$ at arbitrary $T, {f B}$. | | Source: | arXiv, cond-mat/0206406 | | Services: | Forum | Review | PDF | Favorites | |
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