Double exchange interaction in CaMnO3-δ

J. BRIÁTICO; B. ALASCIO; R. ALLUB; A. BUTERA; A. CANEIRO; M.T. CAUSA; M. TOVAR

CZECHOSLOVAK JOURNAL OF PHYSICS

Kluwer Academic Publishers-Plenum Publishers

Año: 1996 vol. 46 p. 2013 - 2014

0011-4626

We have measured electrical resistivity ρ and magnetic susceptibility χ for CaMnO3-δ with 0≤δ≤0.34.Electron hopping between FM clusters formed around the O-vacancies due to double-exchangeinteraction lowers ρ(T). An extension of the Anderson-Hasegawa model including the energy differencesin crystalline Mn sites is presented. Comparison is made with the case of Y substitution for Ca.