Fig. 3: NV decoherence in a P1 bath with extra electron spins.
From: Decoherence of nitrogen-vacancy spin ensembles in a nitrogen electron-nuclear spin bath in diamond
a, b Computed Hahn-echo coherence of NV ensembles for [P1] = 1 ppm (a) and 5 ppm (b) with varying extra spin concentrations ([Ex]) from 0 to 6 ppm. c, d T2 times (c) and stretched exponential parameter (d) of the NV coherence as a function of [Ex] for [P1] = 1 ppm. e, f T2 times (e) and stretched exponential parameter (f) of the NV coherence as a function of [Ex] for [P1] = 5 ppm. In (c, e), the black dotted line shows an experimental T2 time of 65 µs and 30 µs for [P1] = 1.5 ppm and 6 ppm, respectively, taken from the reference29.
