Detection of nanocracks on double fluoride rare earth crystal surface
  Predicted earlier, microcracks on the crystal surface of both finely dispersed $LiYF_4$ powders and single crystals of the Van Vleck paramagnet $% LiTmF_4$ were detected by using the NMR Cryoporometry and Atomic-Force Microscopy technique. 
R.Yu.Abdulsabirov, A.A.Bukharaev, M.R.Zhdanov, R.Sh.Zhdanov,   A.V.Klochkov, S.L.Korableva, V.V.Naletov, N.I.Nurgazizov, M.S...