Spin Resonance Clock Transition of the Endohedral Fullerene 15N@C60

R. T. Harding, S. Zhou, J. Zhou, Thomas Lindvall, W. K. Myers, A. Ardavan, G. A. D. Briggs, K. Porfyrakis, E. A. Laird

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)


The endohedral fullerene 15N@C60 has narrow electron paramagnetic resonance lines which have been proposed as the basis for a condensed-matter portable atomic clock. We measure the low-frequency spectrum of this molecule, identifying and characterizing a clock transition at which the frequency becomes insensitive to magnetic field. We infer a linewidth at the clock field of 100 kHz. Using experimental data, we are able to place a bound on the clock's projected frequency stability. We discuss ways to improve the frequency stability to be competitive with existing miniature clocks.
Original languageEnglish
Article number140801
JournalPhysical Review Letters
Issue number14
Publication statusPublished - 4 Oct 2017
MoE publication typeA1 Journal article-refereed



  • atomic clock
  • electron spin resonance
  • endohedral fullerene


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