Phys. Rev. B 72, 024454 (2005) [6 pages]Role of disorder in phase coexistence in manganites: Noise in layered filmsReceived 18 April 2005; published 25 July 2005 Films of La2∕3Ca1∕3MnO3 were prepared via atomic layer-by-layer epitaxy both as standard solid-solution alloys and as A-site-ordered superlattices of LaMnO3 and CaMnO3 layers. The transport properties were similar, although with a shifted and broadened metal-insulator transition temperature TC in the ordered material. Transport noise near TC was also similar, in both cases revealing a narrow peak in noise magnitude versus temperature. The phase coexistence region near TC has little dependence on the intrinsic disorder of the chemical alloy. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.024454
DOI:
10.1103/PhysRevB.72.024454
PACS:
75.47.Gk, 72.60.+g, 72.70.+m, 75.47.Lx
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