Abstract
This chapter takes a microscopic view of quantum tunneling of magnetization (QTM) in single-molecule magnets (SMMs), focusing on the interplay between exchange and anisotropy. Careful consideration is given to the relationship between molecular symmetry and the symmetry of the spin Hamiltonian that dictates QTM selection rules. Higher order interactions that can modify the usual selection rules are shown to be very sensitive to the exchange strength. In the strong coupling limit, the spin Hamiltonian possesses rigorous D 2h symmetry (or C ∞ in high-symmetry cases). In the case of weaker exchange, additional symmetries may emerge through mixing of excited spin states into the ground state. Group theoretic arguments are introduced to support these ideas, as are extensive results of magnetization hysteresis and electron paramagnetic resonance measurements.
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Acknowledgements
This work was supported by the US National Science Foundation, grant numbers DMR0804408 (SH), CHE0924374 (SH), and DMR0747587 (EdB). Work performed at the National High Magnetic Field Laboratory is supported by the National Science Foundation (grant number DMR1157490), the State of Florida and the Department of Energy.
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Liu, J., del Barco, E., Hill, S. (2014). A Microscopic and Spectroscopic View of Quantum Tunneling of Magnetization. In: Bartolomé, J., Luis, F., Fernández, J. (eds) Molecular Magnets. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40609-6_4
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DOI: https://doi.org/10.1007/978-3-642-40609-6_4
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