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A viable qubit must have a long coherence time T2'>T2T2 . In molecular nanomagnets, T2'>T2T2 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 T2∼390'>T2∼390T2∼390 ns at 1.8 K. We discuss improvements to the experiment that may increase T2'>T2T2 further.
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Collett, Charles A.; Ellers, Kai-Isaak; Russo, Nicholas; Kittilstved, Kevin R.; Timco, Grigore A.; Winpenny, Richard E. P.; and Friedman, Jonathan R., "A Clock Transition in the Cr7Mn Molecular Nanomagnet" (2019). Magnetochemistry. 1458.