Role of Fe (x=0-0.15) Substitution on Structural, Magnetic, and Transport Properties of the La0.7Sr0.3FexMn1-xO3 System

Kumar Navin, Oroosa Subohi, Richard Ball, Rajnish Kurchania

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Abstract

This paper investigates the effect of Fe substitution on the structural, magnetic and transport properties of the La0.7Sr0.3MnxFe1-xO3 (LSMO) system where x ranged between 0 and 0.15. Samples were prepared using a non-aqueous sol-gel synthesis method. Structural and chemical analysis confirmed the Fe3+ substitution at Mn3+ sites without any impurity phase resulted in a small change in structural parameters of the LSMO. The change in magnetic behavior and Curie temperature of the Fe-doped LSMO is explained through competitive exchange interactions developed in the system. The temperature-dependent resistivity demonstrated that the resistivity of the samples increased with Fe concentration due to different conduction mechanisms related to the ferromagnetic-metallic and paramagnetic-insulating regions. The magneto-transport measurement showed significant improvement in the magnetoresistance due to Fe doping at Mn site, which was attributed to enhancement of the spin-glass phase in Fe doped LSMO system. The reduction in magnetoresistance for higher Fe concentration is explained with the help of percolation threshold mechanism.
Original languageEnglish
JournalECS Journal of Solid State Science and Technology
Early online date13 Jul 2021
DOIs
Publication statusE-pub ahead of print - 13 Jul 2021

Keywords

  • B-site doping
  • Nanoscale materials
  • Transport properties
  • Magnetoresistance

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