Abstract
In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a La139 NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature TC=126K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.
| Original language | English |
|---|---|
| Article number | 057203 |
| Journal | Physical Review Letters |
| Volume | 96 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2006 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Shiotani, Y., Sarrao, J. L., & Zheng, G. Q. (2006). Field-induced ferromagnetic order and colossal magnetoresistance in La1.2Sr1.8Mn2O7: A La139 NMR study. Physical Review Letters, 96(5), [057203]. https://doi.org/10.1103/PhysRevLett.96.057203