Enhancing low field magnetoresistance in La0.7Ca0.25Sr0.05MnO3/Mn3O4 composite nanoparticles: unveiling its transport mechanism

IF 3.2 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-11-29 DOI:10.1007/s10971-024-06627-y

Jumaeda Jatmika, Suci Winarsih, Agung Imaduddin, Risdiana

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Abstract

This work explores the low-field magnetoresistance (LFMR) and transport properties of La_0.7Ca_0.25Sr_0.05MnO₃/Mn₃O₄ composite nanoparticles synthesized via the sol-gel method and sintered at temperatures from 700 °C to 900 °C. We investigate particle size (28–32 nm), Mn₃O₄ fraction, structural phases, and their effects on resistivity and LFMR. Rietveld refinement confirms the coexistence of distorted monoclinic and spinel structures, with an increasing Mn₃O₄ fraction correlating to notable shifts in resistivity and LFMR. Temperature-dependent resistivity measurements reveal a transition from metallic to insulator state, with the 30 nm particle and 19% Mn₃O₄ exhibiting lowest resistivity due to reduce in grain boundary effects and the highest conduction bandwidth. A non-monotonous dependence of resistivity at different particle size and Mn₃O₄ fraction has been observed. It is suggested that resistivity in our composite system is influenced by the interplay of grain boundary contributions, Mn₃O₄ phase distribution, and conduction bandwidth. LFMR reaches up to 30% at 5 K and 5 kOe, exceeding values in similar composite systems. These results emphasize the role of Mn₃O₄ as an insulating phase and highlight the impact of nanoparticle size on the enhancement of LFMR, offering insights into optimizing LFMR in such composites.

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增强La0.7Ca0.25Sr0.05MnO3/Mn3O4复合纳米颗粒的低场磁电阻：揭示其输运机制

本文研究了溶胶-凝胶法制备的La0.7Ca0.25Sr0.05MnO3/Mn3O4复合纳米颗粒在700 ~ 900℃烧结条件下的低场磁电阻（LFMR）和输运性能。我们研究了粒径（28-32 nm）、Mn3O4分数、结构相及其对电阻率和LFMR的影响。Rietveld细化证实了扭曲单斜晶和尖晶石结构的共存，Mn3O4分数的增加与电阻率和LFMR的显著变化相关。温度相关的电阻率测量显示从金属状态到绝缘体状态的转变，其中30 nm颗粒和19%的Mn3O4由于晶界效应减少而表现出最低的电阻率和最高的传导带宽。观察到不同粒径和Mn3O4分数下电阻率的非单调关系。结果表明，复合材料的电阻率受晶界贡献、Mn3O4相分布和传导带宽的影响。在5 K和5 kOe时，LFMR高达30%，超过了类似复合系统的值。这些结果强调了Mn3O4作为绝缘相的作用，并强调了纳米颗粒尺寸对LFMR增强的影响，为优化此类复合材料中的LFMR提供了见解。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.