Metamagnetism, giant negative magnetoresistance and spin glass state in the Sm(1-x)SrxMnO3 (x=0.33, 0.45) and RE0.55Sr0.45MnO3 (RE0.55 = Eu0.397Nd0.153, Tb0.25Nd0.30) manganites as well as in the CuCr2X4 (X = S, Se) spinels doped with Sb Author(sстатья
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Аннотация:The experimental evidence of metamagnetism. giant negative magnetoresistance land spin glass state is presented for the compounds under study. An attempt is made to explain the jump-like phase transition of the colossal negative magnetoresistance of -4433% at 153.2 K into the colossal positive magnetoresistance of +980% at 154.2 K for the spinet sample with selenium. It was emphasized that in all the phenomena described in this paper the double exchange magnetic interaction plays the main role.