Excellent magnetoresistive materials have attracted people's attention due to their wide applications. Unfortunately, few cobalt-based perovskite oxides can demonstrate good magnetoresistance (MR) properties. Herein, a new series of SrCo_1-xFe_xO_2.9-δF_0.1 (x = 0, 0.1, 0.2, and 0.3) perovskites are prepared and studied as potential magnetoresistive materials. Room temperature X-ray diffraction (XRD) and Rietveld refinement confirm the simple cubic structure of all samples. The magnetization vs temperature measurement reveals that the magnetic transition temperature goes down with the increase of Fe content, suggesting the weakened ferromagnetism caused by Fe⁴⁺-O-Co³⁺, Fe³⁺-O-Fe³⁺ and Fe⁴⁺-O-Fe⁴⁺ interactions. And the resistivity data of all Fe doped samples can be better fitted using Mott's variable range hopping (VRH) model, suggesting its disordering semi-conduction behavior. Astonishingly, the SrCo_0.8Fe_0.2O_2.9-δF_0.1 ceramic sample owns the giant negative magnetoresistance value of approximately 90% at 5 K in 90 kOe, which is almost the largest negative magnetoresistance in cobalt-based perovskite oxides, indicating that cobalt-based perovskites can be an underlying material system for the research of the potential material applying to magnetic sensors or other spintronic devices.

优良的磁阻材料因其广泛的应用而受到人们的关注。不幸的是，很少有钴基钙钛矿氧化物可以表现出良好的磁阻 (MR) 特性。在此，制备并研究了一系列新的 SrCo _1-x Fe _x O _2.9-δ F _0.1 (x = 0、0.1、0.2和 0.3) 钙钛矿作为潜在的磁阻材料。室温 X 射线衍射 (XRD) 和 Rietveld 精修证实了所有样品的简单立方结构。磁化-温度测量表明，随着Fe含量的增加，磁化转变温度下降，表明Fe ⁴⁺ -O-Co ³⁺ , Fe ³⁺导致铁磁性减弱-O-Fe ³⁺和 Fe ⁴⁺ -O-Fe ⁴⁺相互作用。并且所有 Fe 掺杂样品的电阻率数据可以使用 Mott 的可变范围跳跃 (VRH) 模型更好地拟合，表明其无序半导体行为。令人惊讶的是，SrCo _0.8 Fe _0.2 O _2.9-δ F _0.1陶瓷样品在 5 K、90 kOe 下具有大约 90% 的巨负磁阻值，这几乎是钴基钙钛矿氧化物中最大的负磁阻值，表明钴-基于钙钛矿的基础材料系统可以作为研究应用于磁传感器或其他自旋电子器件的潜在材料的基础材料系统。