Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
Carrier Density Collapse and Colossal Magnetoresistance in Doped Manganites
A novel ferromagnetic transition, accompanied by carrier density collapse, is found in doped charge-transfer insulators with strong electron-phonon coupling. The transition is driven by an exchange interaction of polaronic carriers with localized spins; the strength of the interaction determines whether the transition is first or second order. A giant drop …