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

Authors
  • de Loubens, G.
  • Kent, A. D.
  • Krymov, V.
  • Gerfen, G. J .
  • Beedle, C. C.
  • Hendrickson, D. N.
Type
Published Article
Publication Date
Nov 21, 2007
Submission Date
Sep 13, 2007
Identifiers
DOI: 10.1063/1.2834447
Source
arXiv
License
Unknown
External links

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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