Coherent precession of an individual 5/2 spin
  We present a direct observation of a coherent spin precession of an individual Mn$^{2+}$ ion, having both electronic and nuclear spins equal to 5/2, embedded in a CdTe quantum dot and placed in magnetic field. The spin state evolution is probed in a time-resolved pump-probe measurement of absorption of the single dot. The experiment reveals subtle details of the large-spin coherent dynamics, such as non-sinusoidal evolution of states occupation, and beatings caused by the strain-induced differences in energy levels separation. Sensitivity of the large-spin impurity on the crystal strain opens the possibility of using it as a local strain probe. 
M. Goryca, M. Koperski, P. Wojnar, T. Smole\'nski, T. Kazimierczuk, A.   Golnik, and P. Kossacki
cond-mat.mes-hall