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Effect of particle size on spin glass state and Curie temperature in Sm0.5Ca0.5MnO3 with charge ordering
Journal of Materials Science: Materials in Electronics ( IF 2.8 ) Pub Date : 2021-09-13 , DOI: 10.1007/s10854-021-06931-1
Haiou Wang 1 , Yan Wang 1 , Hui Zhang 1 , Dexin Yang 1 , Lin Yang 1 , Kunpeng Su 1 , Shuai Huang 1 , Dexuan Huo 1
Affiliation  

The particle size and magnetic properties of charge-ordered (CO) Sm0.5Ca0.5MnO3 (SCMO) manganites prepared by solid-state reaction with ball milling have been investigated. Studies on surface morphology and particle size show that the particle size of SCMO manganite without ball milling is relative large (about 4 μm). With the ball milling, the particles begin to disperse, the particle size gradually decreases, and it reaches hundreds to tens of nanometers after milling for 12 h to 36 h. At this time, the particles agglomerate. Magnetization versus temperature (M–T) measurements and the inverse susceptibility versus temperature (χ−1–T) measurements show ferromagnetic (FM) transition at Curie temperature (TC) and spin glass (SG) state at freezing temperature (Tf). Moreover, there is a bulging (sunken) peak near 273 K in the M–T (χ−1–T) curves, suggesting that the CO anti-ferromagnetic (AFM) phase appears in the SCMO. The temperature corresponding to this bulging (sunken) peak represents CO temperature (TCO). The results of magnetization versus field (M–H) loops, M–T curves and χ−1–T curves show that the decrease of particle size with ball milling can suppress the formation of CO-AFM phase, decreasing the Tf, TC, TCO and coercive field (HC). Our work shows that it is a way to tune SG state and Curie temperature by controlling the particle size of the manganites with charge ordering.



中文翻译:

粒径对 Sm0.5Ca0.5MnO3 中自旋玻璃态和居里温度的影响与电荷排序

研究了通过球磨固态反应制备的电荷有序 (CO) Sm 0.5 Ca 0.5 MnO 3 (SCMO) 锰酸盐的粒径和磁性能。表面形貌和粒径的研究表明,未经球磨的SCMO锰矿的粒径较大(约4μm)。随着球磨,颗粒开始分散,粒径逐渐减小,球磨12~36h后达到数百至数十纳米。此时,颗粒聚集。磁化与温度(M-T)的测量和逆磁化率对温度(χ -1 -T)的测量显示在居里温度铁磁(FM)过渡(Ť Ç) 和在冷冻温度 ( T f )下的自旋玻璃 (SG) 状态。此外,在 M-T (χ -1 -T) 曲线中在 273 K 附近有一个凸出(凹陷)峰,表明 CO 反铁磁(AFM)相出现在 SCMO 中。对应于该凸出(下沉)峰的温度代表 CO 温度(T CO)。磁化强度与磁场 (M-H) 环、M-T 曲线和 χ -1 -T 曲线的结果表明,球磨过程中粒径的减小可以抑制 CO-AFM 相的形成,从而降低T f , T C , T CO和矫顽场 ( H C)。我们的工作表明,这是一种通过电荷排序控制锰酸盐的粒径来调节 SG 状态和居里温度的方法。

更新日期:2021-09-13
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