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Large magnetoresistive materials are of immense interest for a number ofspintronic applications by developing high density magnetic memory devices,magnetic sensors and magnetic switches. Colossal magnetoresistance, for whichresistivity changes several order of magnitude (${\sim10^4 \%}$) in an externalmagnetic field, occurs mainly in phase separated oxide materials, namelymanganites, due to the phase competition between the ferromagnetic metallic andthe antiferromagnetic insulating regions. Can one further enhance themagnetoresistance by tuning the volume fraction of the two phases? In thiswork, we report a huge colossal magnetoresistance along with the ultra-sharpmetamagnetic transition in half doped ${Sm_{0.5}Ca_{0.25}Sr_{0.25}MnO_3}$manganite compound by suitably tuning the volume fraction of the competingphases. The obtained magnetoresistance value at 10 K is as large as$\sim10^{13}\%$ in a 30 kOe external magnetic field and $\sim10^{15}\%$ in 90kOe external magnetic field and is several orders of magnitude higher than anyother observed magnetoresistance value reported so far. Using model Hamiltoniancalculations we have shown that the inhomogeneous disorder, deduced fromtunneling electron microscopy, suppresses the CE-type phase and seeds theferromagnetic metal in an external magnetic field.

Huge magnetoresistance and ultra-sharp metamagnetic transition in polycrystalline ${Sm_{0.5}Ca_{0.25}Sr_{0.25}MnO_3}$