Phys. Rev. Lett. 71, 2331–2333 (1993)Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic filmsReceived 14 May 1993; published in the issue dated 4 October 1993 At room temperature a large magnetoresistance, ΔR/R(H=0), of 60% has been observed in thin magnetic films of perovskitelike La-Ba-Mn-O. The films were grown epitaxially on SrTiO3 substrates by off-axis laser deposition. In the as-deposited state, the Curie temperature and the saturation magnetization were considerably lower compared to bulk samples, but were increased by a subsequent heat treatment. The samples show a drop in the resistivity at the magnetic transition, and the existence of magnetic polarons seems to dominate the electric transport in this region. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.2331
DOI:
10.1103/PhysRevLett.71.2331
PACS:
75.70.Ak, 72.15.Gd, 73.50.Jt
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