Large magnetoresistance in low temperature metallic region of manganite compounds (La0.7-2xEux)(Ca0.3Srx)MnO3 (0.05<x<0.15)

TL;DR

This study reports an exceptionally large magnetoresistance of nearly 98% at low temperatures in manganite compounds, occurring in the metallic phase and linked to phase segregation and spin-glass behavior.

Contribution

It demonstrates the occurrence of large magnetoresistance in the metallic region of manganites at low temperatures, highlighting phase segregation effects.

Findings

Large MR of 98% at 5K in x=0.15 sample

MR occurs in the metallic phase, below insulator-metal transition

MR does not vary linearly with magnetic field

Abstract

Magnetoresistance (MR) and magnetization (d.c and a.c) measurements have been carried out on the manganites, (La0.7-2xEux)(Ca0.3Srx)MnO3 (0.05<x<0.15), in the temperature range of 5K-320K. At 5K, an unusually large MR of almost 98% is observed in the x=0.15 sample, nearly up to fields of 4-5 Tesla. This large high-field MR occurs in the metallic region, far below the insulator-metal transition temperature, and does not vary linearly with applied field. The unusual magnetoresistance is explained the light of various possibilities of phase segregation and cluster spin-glass behavior. Keywords: Manganites, High field MR, Phase segregation.