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Open AccessArticle

A Clock Transition in the Cr7Mn Molecular Nanomagnet

Department of Physics and Astronomy, Amherst College, Amherst, MA 01002, USA
Department of Chemistry, University of Massachusetts, Amherst, MA 01003, USA
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;
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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MDPI and ACS Style

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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