The La1-xBaxMnO3 for 0.5≤x was found to be an intrinsic magnetic granular system composed of ferromagnetic/metallic phase and insulating phase. Owing to the magnetic granularity, the La1-xBaxMnO3 system for 0.5≤x shows a three-dimensional percolation-type conduction behavior with a percolation threshold of xp=∼0.85 (i.e. ferromagnetic volume fraction, θp(%), of ∼17%) and a large low field magnetoresistance (MR). The MR of 12-16% at 500 Oe and 77 K was found in the granular ferromagnetic region over a wide range of doping 0.5≤x≤0.75, and the MR was found to become small for x<0.5 and x>0.75.
Bibliographical noteFunding Information:
We thank Drs E. O. Ji and N. H. Huhr for their helps in X-ray analysis. This work was supported by grant No. 2000-2-12100-002-3 from the Basic Research Program of the Korea Science and Engineering Foundation.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry