Kama Ramya, S. Bharadwaj, Someshwar Pola, Gunadhor Singh Okram, Y. Kalyanalakshmi
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引用次数: 0
摘要
本研究讨论了在组成式 La0.67Sr0.33-yNay/2Biy/2MnO3 (y = 0, 0.0825, 0.165, 0.2475, 0.33) 中掺入不同浓度的钠(Na)和铋(Bi)离子对结构、磁性、磁传输和热电研究的影响。X 射线衍射证实了 R\(\:\stackrel{-}{3}\)c 空间群的斜方体结构,场发射扫描电子显微镜图像证实了随着 NaBi 浓度的增加,晶粒的系统生长。在 325 K 以上,观察到铁磁有序性和磁性跃迁在 y = 0.165 时有所增强,之后有所减弱。在随温度变化的电阻率曲线中发现了一个宽最大值和一个双峰现象,在施加外部磁场后,这些现象消失了。随着温度的升高,NaBi 的浓度越低,塞贝克系数也从正值变为负值,而取代度越高,塞贝克系数则变为负值,这表明电荷载流子的性质发生了变化。在高温区,小极子跳变机制控制着电阻率和热功率行为,而在低温区,电子-电子、电子-磁子、磁子-磁子散射机制则起作用。
Effect of co-doping of Na+ and Bi3+ ions on magnetotransport and thermopower studies of La0.67Sr0.33MnO3 manganite
The current work discusses on the effect of sodium (Na) and bismuth (Bi) ion doping at different concentrations in the compositional formula La0.67Sr0.33–yNay/2Biy/2MnO3 (y = 0, 0.0825, 0.165, 0.2475, 0.33) on structural, magnetic, magnetotransport and thermoelectric studies. X-ray diffraction confirms the R\(\:\stackrel{-}{3}\)c space group with rhombohedral structure and the field emission scanning electron microscope images confirms a systematic growth of grains with increasing in NaBi concentrations. An enhancement in the ferromagnetic ordering and magnetic transitions above 325 K were observed up to y = 0.165 and they decrease thereafter. A broad maximum along with a double peak behavior were noticed in the temperature dependent resistivity curves and they disappear upon the application of external magnetic fields. The Seebeck coefficient show a change of sign from positive to negative with increasing temperature for lower concentrations of NaBi and they exhibit a negative sign for higher substitutions suggesting the variation in the nature of charge carriers. The small polaron hopping mechanism governs the resistivity and thermopower behavior in the high temperature regions while, electron-electron, electron-magnon, magnon-magnon scattering mechanism contributes in the low temperature region.
期刊介绍:
Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.