1000% colossal magnetoresistance at room temperature in the A-site ordered perovskite manganites, Sm1-xLax+yBa1-yMn2O6 -: art. no. 046108

We report colossal magnetoresistance at room temperature by introducing disorder to the A-site ordered manganites, SmBaMn2O6. SmBaMn2O6 shows the metal to CE-type charge/orbital ordered insulator transition at 375 K above room temperature. We have achieved a magnetoresistance effect of 340% at room temperature and 300%-600% around room temperature under 9 T in a sintered sample of Sm0.90La0.24Ba0.86Mn2O6. By using a single crystal the magnetoresistance (%) was elevated to 1000% at 9 T, a high value for bulk transition-metal oxides. (c) 2005 American Institute of Physics.