Induced ferromagnetic metallic state and Griffiths phase in La 1/2Ca 1/2Mn 1-xMo xO 3 compounds
Journal
Materials Chemistry and Physics
Journal Volume
136
Journal Issue
1
Pages
254-258
Date Issued
2012
Author(s)
Abstract
We have investigated the magnetic and transport properties of the La 0.5Ca 0.5Mn 1-xMo xO 3 (0.0 ≤ x ≤ 0.1) compounds. Partial substitution of Mn by Mo destroys the charge-ordering (CO) phase and induces the ferromagnetic (FM) metallic transition at low temperatures in the samples. The thermo-magnetic irreversibility observed in both resistivity ρ (T) and magnetization M (T) curves suggest a competing scenario due to the coexistence of different phases in the Mo doped samples. In addition, a deviation from the Curie-Weiss behavior in the inverse susceptibility far above the Curie temperature (T C) indicates the existence of Griffiths phase (GP) in the Mo-doped compounds. The above results can be interpreted based on the induced Mn 2+ species by Mo substitution in the La 0.5Ca 0.5Mn 1-xMo xO 3 system. Highlights: The mixed valence of manganese ions coexist in the Mo substituted samples. Mo doping at Mn site induces the ferromagnetic metallic transition. Resistivity and Magnetization curves exhibit thermo-magnetic irreversibility. Griffiths phase is observed in Mo doped samples. © 2012 Elsevier B.V.
Type
journal article