Relaxation and phonon bottleneck of 169Tm nuclear spins in TmPO 4 : evidence for the direct process ? Y. Roinel, V. Bouffard, J.-F. Jacquinot, C. Fermon et G. FournierJ. Phys. France, 46 10 (1985) 1699-1708DOI: https://doi.org/10.1051/jphys:0198500460100169900
