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

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

2007-09-13

arxiv.org/abs/0709.2146v2

J. Appl. Phys. 103, 07B910 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures, accepted for publication in Journal of Applied Physics (52nd MMM conference proceedings)

Scientific paper

10.1063/1.2834447

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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