Low-field magnetoresistance of La0.7Ca0.3MnO3 perovskite synthesized by reactive milling method

La0.7Ca0.3MnO3 / Mn3O4 composites: Does an insulating secondary phase always enhance the low field magnetoresistance of manganites?

“…There is a significant scattering of the data points but the dispersion is actually much smaller than expected: considering that the data points correspond to samples with different porosities, grain sizes, grain connectivities,… (due to different synthesis conditions), the agreement is actually amazingly good. It is interesting to note that a similar trend was reported in a study of Manh et al, 23 who found a linear increase of MR spt versus 1/CS for La 0.7 Ca 0.3 MnO 3 samples at 30 K, where MR spt is the contribution of intergranular spin-polarized transport.…”

Size effects and interactions in La0.7Ca0.3MnO3 nanoparticles

“…Furthermore, the temperature dependence of magnetization was found to follow a T ε behavior with ε = 1.7, which slightly deviates from the Bloch law. We have also reported the effect of particle size in the range of 16-73 nm on the magnetic, electrical properties and low-field magnetoresistance of LCMO nanoparticle samples [19,20]. In this study, we present a systematic investigation of magnetic characteristics associated with the finite-size effects and the interparticle interactions for the above-mentioned LCMO samples.…”

Studies on La0.67Ca0.33MnO3–SrTiO3 composites using two-phase model

“…For a better understanding of CMR a large number of studies have been carried out in single crystals [6], thin films [7,8], polycrystalline CMR materials [9,10] and CMR-based composites [11][12][13][14][15][16][17][18]. Many groups have attempted to synthesize CMR-insulator composites, such as La 0.67 Ca 0.33 MnO 3 (LCMO)-MgO [11], LCMO-BaTiO 3 (BTO) [12,13], LCMO-Al 2 O 3 [14,15], La 0.67 Sr 0.33 MnO 3 -La 2 O 3 -La(OH) 3 [16], La 0.67 Sr 0.33 MnO 3 -polyaniline [17] and LCMO-SrTiO 3 (STO) [18], etc.…”