We observed huge magnetoresistance (~ 1015% in 90 kOe external magnetic field and 1013% in 30 kOe external magnetic field) at 10 K by engineering electronic phase separation in charge-ordered half-doped manganites. The observed huge value of magnetoresistance is explained by double-exchange model Hamiltonian calculations. Moreover, our electronic phase-controlled material, namely Sm0.5Ca0.25Sr0.25MnO3, shows an ultrasharp metamagnetic transition below 10 K, which is martensitic in nature. The many order of magnitudes higher magnetoresistance in Sm0.5Ca0.25Sr0.25MnO3 than any other magnetoresistive materials reported so far will motivate further experimental work.
- Sanjib Banik
- Kalipada Das
- Indranil Das
