Improved properties of La2/3Ca1/3MnO3 thin films by addition of silver

Thin films of Ag-added ${\mathrm{La}}_{\mathrm{2/3}}{\mathrm{Ca}}_{\mathrm{1/3}}{\mathrm{MnO}}_{\mathrm{3}}$ exhibit enhancement of several desirable characteristics over the pristine counterparts. We find that the addition of Ag results in a pronounced increase in the insulator–metal transition temperature ${\mathrm{(T}}_p)$ and ferromagnetic transition temperature ${\mathrm{(T}}_c\mathrm{).}$ There is also a remarkable improvement in the magnetic and electrical homogeneity of the samples as indicated by narrower ferromagnetic resonance linewidths and narrower resistive transitions, respectively. The observed improvement in properties is inferred to be largely associated with improved oxygen stoichiometry of the films although microstructural effects are not ruled out.