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We have been able to synthesize Lu+3 substituted La0.67Ca0.33MnO3 (LCMO) byan auto-combustion method. Synthesis of this compound is not successful byconventional ceramic or other chemical methods. Magnetic and electricaltransport properties of the Lu substituted LCMO [(La1-xLux)0.67Ca0.33MnO3 (0 <x < 0.12)] system have been investigated and compared with those of the Y+3,Pr+3, Dy+3 and Tb+3 substituted LCMO systems. All the compounds show aferromagnetic metal to paramagnetic insulator transition at TC. The tolerancefactor reduces from 0.917 for x = 0 to 0.909 for x = 0.12 and for this rangeall are ferromagnetic metals indicating the dominance of the coupling betweenspins due to double exchange over the antiferromagnetic superexchangeinteraction. The transition temperatures and magnetization decrease as the Luconcentration increases. This is satisfactorily accounted for on the basis oftransition from ferromagnetic at x = 0 to canted spin order for x > 0. All thesamples show higher magnitude of MR compared to that in pure LCMO at 80 kOefield in the temperature range of 5 to 320K. A fairly high value of low fieldmagnetoresistance (LFMR) of about 30% is obtained in all the samples at a fieldless than 5 kOe.Comment: Total 35 pages of text and figure

journal of physics. condensed matter

Low temperature synthesis, and magnetic and magnetotransport properties of a (La1 xLux)0.67Ca0.33MnO3(0 x 0.12) system