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arXiv · 0709.2146

High frequency EPR on dilute solutions of the single molecule magnet Ni$_4$

G. de Loubens·A. D. Kent·V. Krymov·G. J . Gerfen·C. C. Beedle·D. N. Hendrickson
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Abstract

Dilute frozen solutions of the single molecule magnet Ni$_4$ (S=4) have been studied using high frequency D-band (130 GHz) EPR. Despite the random orientation of the molecules, well defined EPR absorption peaks are observed, due to the strong variation of the splittings between the different spin-states on magnetic field. Temperature dependent studies above 4 K and comparison with simulations enable identification of the spin transitions and determination of the Hamiltonian parameters. The latter are found to be close to those of Ni$_4$ single crystals. No echo was detected from Ni$_4$ in pulsed experiments, which sets an upper bound of about 50 ns on the spin coherence time.

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G. de Loubens, A. D. Kent, V. Krymov, G. J . Gerfen, C. C. Beedle, D. N. Hendrickson. 2007-11-21. High frequency EPR on dilute solutions of the single molecule magnet Ni$_4$. https://doi.org/10.1063/1.2834447

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