Complex oxides represent a class of materials with a plethora of fascinating properties like ferroelectricity, superconductivity, colossal magneto-resistance effect etc. The intriguing interplay of charge, spin and orbital ordering in these systems superimposed by the lattice effects opens a scientifically rewarding playground for both fundamental and application-oriented research. One such class of oxide materials is the perovskite manganites which exhibit large magneto-resistance effect commonly known as colossal magneto-resistance (CMR). In the present work we have studied the...