The impact of niobium doping upon the magnetotransport properties of the oxygen-deficient perovskite SrCo1-xNbxO3-d

TL;DR

This study investigates how niobium doping affects the magnetotransport properties of oxygen-deficient SrCo1-xNbxO3-d, revealing significant ferromagnetic and magnetoresistive behaviors linked to magnetic disorder.

Contribution

It provides new insights into the magnetic and transport properties of Nb-doped SrCoO3-d, highlighting the relationship between doping-induced disorder and magnetoresistance.

Findings

Ferromagnetic transition at 130-150 K

Magnetoresistance reaches 30% at 5 K in 7 T

Disordered magnetic state induced by Nb doping

Abstract

The oxygen-deficient perovskite cobaltite SrCo1-xNbxO3-d was synthesized by direct solid-state reaction and its magnetotransport properties were investigated. This cobaltite exhibits an unusual ferromagnetic behavior with a transition temperature Tm = 130-150 K and a spin glass like behavior below Tm. Importantly, this phase reaches a large magnetoresistance (MR) value, MR = -(rH - r0) / r0 = 30% at 5 K in 7 T. The large MR effect is believed to be related to the disordered magnetic state induced by the Nb-for-Co substitution.