2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/23771In this communication the enhancement of low temperature magnetoresistance in polycrystalline La1-xCaxMnO3 manganites is discussed. It is shown that so-called grain boundary effects seem to be the simplest and natural explanation of this phenomenon.9 pagesStrongly Correlated ElectronsMaterials Sciencetext