Abstract The effect of oxygen deficiency and oxygen excess on the magnetic and electrical transport properties of La0.67Sr0.33MnO3 has been investigated. The thermal and isothermal magnetization measurement results show that the Curie temperature and saturation magnetization of oxygen deficient sample (defined as A) are higher than those oxygen excess sample (defined as B). The electrical resistivity of A is lower than that of B in studied temperature range. The magnetoresistance (MR) of B is larger than that of A in the temperature range from 280 to 360 K, which agrees with the magnetic field needed full spin polarization at room temperature. The colossal MR (CMR) around transition temperature from ferromagnetic metal to paramagnetic insulator (TMI) for A is larger than that for B, which arises from assistance of stronger lattice deformation for A.

中文翻译：

---

氧非化学计量比对 La0.67Sr0.33MnO3 磁电传输性能的影响

摘要 研究了缺氧和氧过量对 La0.67Sr0.33MnO3 的磁和电传输性能的影响。热和等温磁化强度测量结果表明，缺氧样品（定义为A）的居里温度和饱和磁化强度高于氧过量样品（定义为B）。在研究的温度范围内，A 的电阻率低于 B 的电阻率。在 280 到 360 K 的温度范围内，B 的磁阻 (MR) 大于 A，这与室温下完全自旋极化所需的磁​​场一致。A 的铁磁金属到顺磁绝缘体 (TMI) 转变温度附近的巨大 MR (CMR) 大于 B，