Effect of pressure on steplike magnetostriction of single crystalline (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayered manganite

TL;DR

This study investigates how pressure and electric current influence the sharp magnetostriction changes in a bilayered manganite, revealing that both factors suppress the steplike transition by promoting ferromagnetic interactions and delocalization of charge carriers.

Contribution

It demonstrates that pressure and electric current weaken the steplike magnetostriction in bilayered manganite, linking the phenomenon to localized charge carriers and phase stability.

Findings

Pressure suppresses the steplike transformation.

Electric current weakens magnetostriction and magnetoresistance steps.

Steplike behavior is related to localized charge carriers.

Abstract

e report the effect of pressure on the steplike magnetostriction of single crystalline bilayered manganite (LaPr)1.2Sr1.8Mn2O8, for our understandings of the ultrasharp nature of the field-induced first-order transition from a paramagnetic insulator to a ferromagnetic metal phase. The application of pressure suppresses a steplike transformation and causes a broad change in the magnetostriction. The injection of an electric current to the crystal also weakens the steplike variation in both the magnetostriction and magnetoresistance. The stabilization of ferromagnetic interaction or the delocalization of charge carriers is promoted with the applied pressure or applied current, resulting in the suppressed steplike behavior. Our findings suggest that the step phenomenon is closely related to the existence of localized carriers such as the short-range charge-orbital ordered clusters.