Abstract
We have investigated the appearance of ferromagnetism in a mixture of nonferromagnets (Formula presented) and (Formula presented), without heterovalent ion substitution in La sites. (Formula presented)(Formula presented)(Formula presented) and (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented) are studied by using x-ray-absorption and resonant photoemission spectroscopies. The results show that the dopant Co in (Formula presented)(Formula presented)(Formula presented) becomes divalent rather than expected trivalent and induces (Formula presented)-(Formula presented) mixed valence states. Therefore, at variance with the earlier proposal of a structure-induced (Formula presented)-(Formula presented) ferromagnetic coupling, the ferromagnetic state in (Formula presented)(Formula presented)(Formula presented) is consistent with the (Formula presented)-(Formula presented) double-exchange mechanism.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 11072-11075 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 55 |
| Issue number | 17 |
| DOIs | |
| State | Published - 1997 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics