通过测量样品的M-T曲线、M-H曲线、ESR曲线、红外光谱、拉曼光谱、ρ-T曲线和MR-T曲线,研究了双掺杂La0.67+1.33xSr0.33-1.33xMn1-xMgxO3(0.00≤x≤0.25)体系的磁电性质和输运行为.对x=0.10和0.15,在温度高于Tconset时出现相分离;对x=0.20和0.25,在低温区出现了反铁磁(AFM)行为.x=0.05的ρ-T关系存在金属-绝缘体(MI)转变;x≥0.15的所有样品在测量温区内显示绝缘体行为.这些奇异现象用M-H关系、ESR曲线和拉曼光谱给予了很好的解释.
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