The effect of grain size on electrical transport and magnetic properties of La0.9Te0.1MnO3

TL;DR

This study investigates how grain size influences the structural, magnetic, and transport properties of La0.9Te0.1MnO3, revealing that grain size affects bond angles, magnetic transition temperatures, and magnetoresistance, enabling property tuning.

Contribution

It provides new insights into how grain size manipulation can control magnetic and transport properties in electron-doped manganites.

Findings

Magnetization and Curie temperature decrease with increasing grain size.

Magnetoresistance can be tuned by adjusting grain size.

Structural parameters like Mn-O bond length vary with grain size.

Abstract

The effect of grain size on structural, magnetic and transport properties in electron-doped manganites La0.9Te0.1MnO3 has been investigated. All samples show a rhombohedral structure with the space group at room temperature. It shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increases with the increase of grain size. All samples undergo paramagnetic (PM)-ferromagnetic (FM) phase transition and an interesting phenomenon that both magnetization and the Curie temperature decrease with increasing grain size is observed, which is suggested to mainly originate from the increase of the Mn-O bond length . Additionally, obviously increases with decreasing grain size due to the increase of both the height and width of tunneling barriers with decreasing the grain size. The results indicate that both the intrinsic colossal magnetoresistance (CMR) and the extrinsic the extrinsic interfacial magnetoresistance (IMR) can be effectively tuned in La0.9Te0.1MnO3 by changing grain size.