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Colossal Magnetoresistance (CMR) and Giant Magnetoresistance (GMR) are two important magnetotransport phenomena in materials science, both describing large changes in electrical resistance under applied magnetic fields. CMR is observed mainly in mixed-valence manganites such as La₁₋ₓCaₓMnO₃ and La₁₋ₓSrₓMnO₃. These perovskite oxides show an enormous drop in resistivity when ____ ___ _______ ____ ________ _______.
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