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Open AccessArticle

A Clock Transition in the Cr7Mn Molecular Nanomagnet

1
Department of Physics and Astronomy, Amherst College, Amherst, MA 01002, USA
2
Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA
3
School of Chemistry, The University of Manchester, Manchester M13 9PL, UK
*
Author to whom correspondence should be addressed.
Current address: Department of Physics, Boston University, Boston, MA 02215, USA.
Magnetochemistry 2019, 5(1), 4; https://doi.org/10.3390/magnetochemistry5010004
Received: 21 November 2018 / Revised: 4 January 2019 / Accepted: 10 January 2019 / Published: 14 January 2019
(This article belongs to the Special Issue Controlling Molecular Nanomagnets)
A viable qubit must have a long coherence time T 2 . In molecular nanomagnets, T 2 is often limited at low temperatures by the presence of dipole and hyperfine interactions, which are often mitigated through sample dilution, chemical engineering and isotope substitution in synthesis. Atomic-clock transitions offer another route to reducing decoherence from environmental fields by reducing the effective susceptibility of the working transition to field fluctuations. The Cr7Mn molecular nanomagnet, a heterometallic ring, features a clock transition at zero field. Both continuous-wave and spin-echo electron-spin resonance experiments on Cr7Mn samples, diluted via co-crystallization, show evidence of the effects of the clock transition with a maximum T 2 390 ns at 1.8 K. We discuss improvements to the experiment that may increase T 2 further. View Full-Text
Keywords: electron spin resonance; clock transition; molecular nanomagnet electron spin resonance; clock transition; molecular nanomagnet
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Collett, C.A.; Ellers, K.-I.; Russo, N.; Kittilstved, K.R.; Timco, G.A.; Winpenny, R.E.P.; Friedman, J.R. A Clock Transition in the Cr7Mn Molecular Nanomagnet. Magnetochemistry 2019, 5, 4.

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