Induced ferromagnetic metallic state and Griffiths phase in La1/2Ca1/2Mn1−xMoxO3 compounds

We have investigated the magnetic and transport properties of the La0.5Ca0.5Mn1−xMoxO3 (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 (TC) indicates the existence of Griffiths phase (GP) in the Mo-doped compounds. The above results can be interpreted based on the induced Mn2+ species by Mo substitution in the La0.5Ca0.5Mn1−xMoxO3 system.

► 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.