Transport-magnetism correlations in the ferromagnetic oxide La0.7Ca0.3MnO3
- 7 August 1995
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 67 (6) , 860-862
- https://doi.org/10.1063/1.115529
Abstract
We present results of temperature and magnetic field dependent resistivity ρ(H,T) and bulk magnetization M(H,T) measurements on post‐annealed La0.7Ca0.3MnO3 thin films that were grown via pulsed‐laser deposition. Both the resistivity and the anomalously large negative magnetoresistance peak near the ferromagnetic ordering temperature (Tc=250 K), with Δρ/ρ0=−85% at 50 kOe. A clear correlation is found between ρ and M that is described by the phenomenological expression ρ(H,T)∝exp[−M(H,T)/M0]. This correlation reflects the important interplay between transport and magnetism in this system, and suggests that the transport below Tc involves polaron hopping.Keywords
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