Phase separated behavior in Yttrium doped CaMnO3

TL;DR

This study investigates how electron doping affects the structural, magnetic, and transport properties of Ca1-xYxMnO3, revealing phase separation, magnetic transitions, and structural changes with doping levels.

Contribution

It provides new insights into phase separation and magnetic behavior in Y-doped CaMnO3, highlighting the coexistence of different magnetic and structural phases.

Findings

Phase separation with ferromagnetic domains in x=0.1 sample.

Structural transition from orthorhombic to monoclinic at x=0.2.

Suppressed ferromagnetism and coexisting magnetic structures at higher doping.

Abstract

The effect of electron doping on the structural, transport, and magnetic properties of Mn (IV) - rich Ca1-xYxMnO3 (x < 0.2) samples have been investigated using neutron diffraction, neutron depolarization, magnetization and resistivity techniques. The temperature dependence of resistivity follows the small polaron model and the activation energy exhibits a minimum for x=0.1 sample. A phase separated magnetic ground state consisting of ferromagnetic domains (~7microns) embedded in G-type antiferromagnetic matrix is observed in the sample, x = 0.1. The transition to the long range magnetically ordered state in this sample is preceded by a Griffiths phase. On lowering temperature below 300K a structural transition from orthorhombic structure (Pnma) to a monoclinic structure (P21/m) is observed in the case of x=0.2 sample. The ferromagnetic behavior in this case is suppressed and the antiferromagnetic ordering is described by coexisting C-type and G-type magnetic structures corresponding to the monoclinic and orthorhombic phases, respectively.<