In Nd0.7Sr0.3MnO3 films, ranging in peak resistivity from 1000 Ω-cm to ≤1 Ω-cm, and exhibiting large magnetoresistance effects, the zero-field resistivity above the peak temperature Tp exhibits thermally activated behavior with an activation energy of 0.115±0.005 eV. At T well below Tp, the magnetoconductivity, rather than the magnetoresistance, is linear in B and this linear dependence is observed over a wide B range even when the magnetization is essentially saturated. A cross-over from the linear relation to σ increasing as B2 is observed near and above Tp. A tentative model is proposed.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry