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首页> 外文期刊>Materials Science and Engineering >Effect of A-site cation size on magnetic and charge-ordering properties of Ln_(0.5)Sr_(0.5)Mn_(0.9)Cu_(0.1)O_3 (Ln = La, Pr, Nd, or Ho)
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Effect of A-site cation size on magnetic and charge-ordering properties of Ln_(0.5)Sr_(0.5)Mn_(0.9)Cu_(0.1)O_3 (Ln = La, Pr, Nd, or Ho)

机译:A位阳离子大小对Ln_(0.5)Sr_(0.5)Mn_(0.9)Cu_(0.1)O_3(Ln = La,Pr,Nd或Ho)的磁性和电荷有序性能的影响

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摘要

The structural, magnetic, and electrical properties of Ln_(0.5)Sr_(0.5)Mn_(0.9)Cu_(0.1)O_3 (Ln = La, Pr, Nd, or Ho) per ovskite manganites have been investigated to explore the influence of A-site cation radius ((r_A)) and the A-site cation size-disorder (σ~2) on the various interdependent phenomena such as ferromagnetism (FM), phase separation (PS), and charge ordering (CO). The temperature dependence magnetization (M-T) curve of La-based sample shows four distinct points at ~269K, 255 K, 200 K, and 148K corre sponding to strong FM, cluster glass (CG), weak FM, and charged ordered antiferromagnetic (COAFM) transitions, respectively. Our investigation shows that Neel temperatures (T_N) increases, whereas Curie (T_c) and irreversibility temperatures (T_(irr)) decrease with decreasing (r_A), i.e., with increasing σ~2. Further more, the value of the magnetization decreases and resistivity increases with decreasing (r_A). All samples exhibit insulating behavior in the temperature range 77-300 K and above 110 K the electronic conduction mechanism has been described within the framework of the variable range hopping (VRH) model.
机译:研究了每个钙钛矿锰矿的Ln_(0.5)Sr_(0.5)Mn_(0.9)Cu_(0.1)O_3(Ln = La,Pr,Nd或Ho)的结构,磁性和电学性质,以探讨A的影响-位阳离子半径((r_A))和A-位阳离子大小无序(σ〜2)涉及各种相互依赖的现象,例如铁磁性(FM),相分离(PS)和电荷排序(CO)。 La基样品的温度依赖性磁化(MT)曲线在269K,255 K,200 K和148K处显示四个不同的点,分别对应于强FM,簇玻璃(CG),弱FM和带电有序反铁磁(COAFM) )的过渡。我们的研究表明,尼尔温度(T_N)升高,而居里温度(T_c)和不可逆温度(T_(irr))随(r_A)降低而降低,即σ〜2升高。此外,随着(r_A)的减小,磁化的值减小并且电阻率增大。所有样品在77-300 K和110 K以上的温度范围内均表现出绝缘性能,在可变范围跳变(VRH)模型的框架内描述了电子传导机理。

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