Glassiness in charge dynamics of half-doped manganite: A study on oxygen-deficient charge-ordered R0.5Ca0.5MnO3−δ (R = Pr, Nd and Sm)A. Karmakar, S. Majumdar, S. Banerjee and S. GiriEPL, 92 5 (2010) 57009DOI: https://doi.org/10.1209/0295-5075/92/57009