• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Low temperature magnetic and transport properties of LSMO-PZT nanocomposites
【24h】

Low temperature magnetic and transport properties of LSMO-PZT nanocomposites

机译：LSMO-PZT纳米复合材料的低温磁性和传输性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nanocomposites of La0.7Sr0.3MnO3-PbZr0.52Ti0.48O3 (LSMO-PZT) with varying PZT content have been synthesized by sol-gel method. XRD, HRTEM, SEM and EDX studies confirm the coexistence of both components (viz. LSMO and PZT) in the composites and reveal that the PZT nanoparticles occupy the surface and the grain boundaries (GBs). The M-H measurement of LSMO-PZT composites exhibits a weak ferromagnetic nature with low coercivities of 0.0123 T and 0.0142 T at 300 K and 80 K, respectively, and the highest magnetic moment (n(B)) achieved is 2.069 mu(B) at 80 K for x = 0.01. The M-T studies confirm that the transition temperature (T-c) approximate to 360 K and the maximum entropy changes (Delta S-m) are 0.40, 0.35 and 0.25 mJ Kg(-1) K-1 at the magnetic field H-max = 100 Oe for x = 0.01, 0.02 and 0.05, respectively. The average particle size of LSMO, PZT, and LSMO-PZT nanocomposites range between 24-30 nm, as confirmed from XRD, TEM, and magnetic measurements. Electrical resistivity studies show that the insulator-metal transition temperature (T-IM) decreases rapidly with addition of a small amount of PZT and then remains almost constant with a higher concentration of PZT. The conduction in the insulator region is governed by tunneling between magnetic phases and in the metallic region the conduction shows non-Fermi liquid behavior. The resistivity increases with increasing PZT concentration. The energy barriers and scatterings are responsible for the increase in higher resistivity observed. The magneto-resistance (%MR) has been found to decrease with decreasing temperature. Variation in the MR at low temperature in LSMO-the PZT nanocomposite is due to the effect of the large spin polarization and pinning of domain walls at the GBs.
机译：通过溶胶-凝胶法合成了具有不同PZT含量的La0.7Sr0.3MnO3-PbZr0.52Ti0.48O3（LSMO-PZT）纳米复合材料。 XRD，HRTEM，SEM和EDX研究证实了复合材料中两种组分（即LSMO和PZT）的共存，并揭示了PZT纳米颗粒占据了表面和晶界（GBs）。 LSMO-PZT复合材料的MH测量显示出弱的铁磁特性，在300 K和80 K时的矫顽力分别为0.0123 T和0.0142 T的低矫顽力，并且在110 K时达到的最高磁矩（n（B））为2.069 mu（B） x = 0.01时为80K。 MT研究证实，在磁场H-max = 100 Oe的情况下，转变温度（Tc）大约为360 K，最大熵变化（Delta Sm）为0.40、0.35和0.25 mJ Kg（-1）K-1。 x分别为0.01、0.02和0.05。 LSMO，PZT和LSMO-PZT纳米复合材料的平均粒径在24-30 nm之间，这已通过XRD，TEM和磁测量得到了证实。电阻率研究表明，添加少量的PZT会使绝缘体-金属的转变温度（T-IM）迅速降低，然后在较高的PZT浓度下几乎保持恒定。绝缘子区域的传导受磁相之间的隧穿控制，在金属区域的传导表现出非费米液体行为。电阻率随PZT浓度的增加而增加。能量垒和散射是所观察到的较高电阻率增加的原因。已经发现，磁阻（％MR）随着温度降低而降低。 LSMO-PZT纳米复合材料在低温下的MR变化是由于大自旋极化和GBs畴壁钉扎的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号