| 引用本文： |
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刘娇,云慧琴,田野,邢茹,赵建军.Co掺杂对钙钛矿锰氧化物La0.8Sr0.2MnO3磁性的影响[J].低温物理学报,2018,(6):13-17. [点击复制]
- LIU Jiao,YUN HuiQin,TIAN Ye,XING Ru,Zhao Jianjun.Magnetic Effects of Co-doped Perovskite Manganese Oxide La0.8Sr0.2MnO3[J].LOW TEMPERATURE PHYSICAL LETTERS,2018,(6):13-17. [点击复制]
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| 摘要: |
| 采用传统的高温固相反应法制备La0.8Sr0.2Mn1-xCoxO3（x=0，0.1）系列多晶样品，采用X射线衍射（XRD）测量样品的结构，并用物性测量系统（PPMS）探究样品的磁化强度随温度的变化曲线（M-T），以及在不同的温度下磁化强度随外加磁场的变化曲线（M-H）。结果表明：当温度高于TG时，样品呈现出纯顺磁态，当TG
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| 关键词: 锰氧化物 磁性 类Griffiths相 |
| DOI：10.13380/j.ltpl.2019.01.003 |
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| 基金项目: |
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| Magnetic Effects of Co-doped Perovskite Manganese Oxide La0.8Sr0.2MnO3 |
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LIU Jiao1, YUN HuiQin1, TIAN Ye1, XING Ru1,2, Zhao Jianjun1,2
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| (1.Baotou teachers college physics institute of science and technology, Baotou, Inner Mongolia, 014030;2.Key laboratory for magnetism and magnetic material of Inner Mongolia autonomous region, Baotou teachers college, Inner Mongolia Baotou, 014030) |
| Abstract: |
| La0.8Sr0.2Mn1-xCoxO3（x=0，0.1）samples were prepared via the traditional high-temperature solid-state reaction method．The structure of the sample was measured using X-ray diffraction(XRD) and the physical property measurement system(PPMS)to obtain the sample magnetization curve(M-T )．The magnetization at different temperatures was analyzed with the applied magnetic field curve and in magnetization at different temperatures and the change curve of the magnetic field curve(M-H )．The results show that when the temperature (T) is higher than TG ,the samples show apurepar a magnetic state; when TG＜T＜TC ,the ferromagnetic and paramagnetic phases coexist in the system．According to the fitting of the Curie-Weiss and Griffiths phase model, it is found that the curve of the reciprocal of the magnetic susceptibility and temperatures satisfies χ -1∝(T－TCRand)λ(０＜λ＜１)．Therefore, the system may contain a Griffiths-like phase．Compared with x＝0,TC and TN in La0.8Sr0.2Mn1-xCoxO3（x=0，0.1）,doped with a small amount of Co, is obviously decreased, which may because Co replaces a part of Mn３＋ and directly affects the ratio between Mn3+ and Mn4+ ,there by weakening the double exchange interaction of Mn3+－O2-－Mn4+ |
| Key words: manganese oxide Magnetic Griffiths-likephase |
