Cr-doping effect on the orbital fluctuation of heavily doped Nd1-xSrxMnO3 (x ~ 0.625)

TL;DR

This study explores how Cr-doping influences orbital fluctuations and magnetic properties in heavily doped Nd1-xSrxMnO3, revealing a reentrant phase behavior near a critical doping level.

Contribution

It provides new insights into the phase boundary and crossover phenomena induced by Cr-doping in Nd1-xSrxMnO3 near orbital ordered states.

Findings

Cr-doping suppresses ferromagnetic correlation and magnetoresistance at low y

Reentrant behavior of magnetic properties occurs around y=0.05

Phase boundary or crossover is identified at y=0.05

Abstract

We have investigated the Cr-doping effect of Nd0.375Sr0.625MnO3 near the phase boundary between the x2-y2 and 3z2-r2 orbital ordered states, where a ferromagnetic correlation and concomitant large magnetoresistance are observed owing to orbital fluctuation. Cr-doping steeply suppresses the ferromagnetic correlation and magnetoresistance in Nd0.375Sr0.625Mn1-yCryO3 with 0 < y < 0.05, while they reappear in 0.05 < y < 0.10. Such a reentrant behavior implies that a phase boundary is located at y = 0.05, or a phase crossover occurs across y = 0.05.