Structural, magnetic and transport properties in the Cu-doped manganites La0.85Te0.15Mn1-xCuxO3 (0 \leq x \leq 0.20)

TL;DR

This study investigates how Cu-doping affects the structural, magnetic, and transport properties of La0.85Te0.15Mn1-xCuxO3 manganites, revealing changes in phase transition temperatures, magnetic behavior, and electrical conductivity with increasing Cu content.

Contribution

It provides new insights into the effects of Cu-doping on electron-doped manganites, including valence state determination and detailed property variations.

Findings

Curie temperature decreases with Cu-doping

Insulator-metal transition shifts to lower temperatures

High Cu-doping suppresses the double-peak resistivity behavior

Abstract

The effect of Cu-doping at Mn-site on structural, magnetic and transport properties in electron-doped manganites La0.85Te0.15Mn1-xCuxO3 has been investigated. Based on the analysis of structural parameter variations, the valence state of the Cu ion in Cu-doped manganites is suggested to be +2. All samples undergo the paramagnetic-ferromagnetic (PM-FM) phase transition. The Curie temperature decreases and the transition becomes broader with increasing Cu-doping level, in contrast, the magnetization magnitude of Cu-doping samples at low temperatures increase as x \leq 0.15. The insulator-metal (I-M) transition moves to lower temperatures with increasing Cu-doping content and disappears as x > 0.1. In addition, the higher temperature resistivity r peak in double-peak-like r(T) curves observed in no Cu-doping sample is completely suppressed as Cu-doping level x = 0.1 and r(T) curve only shows single I-M transition at the low temperature well below . The results are discussed according to the change of magnetic exchange interaction caused by Cu-doping.