Comparative study of magnetic and magnetotransport properties of Sm0.55Sr0.45MnO3 thin films grown on different substrates

TL;DR

This study compares the magnetic and magnetotransport properties of Sm0.55Sr0.45MnO3 thin films grown on different substrates, revealing how substrate-induced strain and disorder influence phase coexistence and colossal magnetoresistance.

Contribution

It provides a comparative analysis of strain effects on magnetic phases and magnetoresistance in Sm0.55Sr0.45MnO3 thin films, highlighting substrate-dependent phase coexistence.

Findings

Films exhibit colossal magnetoresistance with distinct temperature and field dependence.

Presence of metamagnetic transitions at low temperatures.

Strain and disorder influence the balance of magnetic phases.

Abstract

Highly oriented polycrystalline SSMO thin films deposited on single crystal substrates by ultrasonic nebulized spray pyrolysis have been studied. The film on LAO is under compressive strain while LSAT and STO are under tensile strain. The presence of a metamagnetic state akin to cluster glass formed due to coexisting FM and antiferromagnetic/charge order (AFM/CO) clusters. All the films show colossal magnetoresistance but its temperature and magnetic field dependence are drastically different. In the lower temperature region the magnetic field dependent isothermal resistivity also shows signature of metamagnetic transitions. The observed results have been explained in terms of the variation of the relative fractions of the coexisting FM and AFM/CO phases as a function of the substrate induced strain and oxygen vacancy induced quenched disorder.