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Co掺杂对钙钛矿锰氧化物La0.8Sr0.2MnO3磁性的影响
刘娇,云慧琴,田野,邢茹,赵建军
0
(包头师范学院 物理科学与技术学院,内蒙古 包头 014030;内蒙古自治区磁学与磁性材料重点实验室,包头师范学院,内蒙古 包头 014030)
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
关键词:  锰氧化物  磁性  类Griffiths相
DOI:10.13380/j.ltpl.2019.01.003
基金项目:
Magnetic Effects of Co-doped Perovskite Manganese Oxide La0.8Sr0.2MnO3
LIU Jiao,YUN HuiQin,TIAN Ye,XING Ru,Zhao Jianjun
(Baotou teachers college physics institute of science and technology, Baotou, Inner Mongolia, 014030;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

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