Colossal positive magneto-resistance in oxygen deficient Ca4Mn3O10

Huge change of resistance by an external magnetic field, i.e. colossal magneto-resistance effect, has been a long-lived theme of research due to both fundamental science and device applications. Here we report colossal positive magneto-resistance (> 1200% at a temperature of 4K and a magnetic field of 9 T) discovered in oxygen deficient Ca
₄
Mn
₃
O
₁₀
phase. The structural, magnetic and magneto transport properties are discussed.