Irreversible Effects in LaGa1-xMnxO3
  Quasi-irreversible increase in the electrical conductivity is observed in single crystals of LaGa1-xMnxO3. The effect lasts for long time at room temperature and can be erased by heating of the crystal above the phase transition temperature. We explain the observed effects in terms of ionization and local lattice distortion processes. 
N. Noginova, F. Chen, E. Etheridge