Phys. Rev. Lett. 89, 237203 (2002) [4 pages]Intrinsic Inhomogeneities in Manganite Thin Films Investigated with Scanning Tunneling SpectroscopyReceived 18 April 2002; published 13 November 2002 Thin films of La0.7Sr0.3MnO3 on MgO show a metal insulator transition and colossal magnetoresistance. The shape of this transition can be explained by intrinsic spatial inhomogeneities, which give rise to a domain structure of conducting and insulating domains at the submicrometer scale. These domains then undergo a percolation transition. The tunneling conductance and tunneling gap measured by scanning tunneling spectroscopy were used to distinguish and visualize these domains. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.237203
DOI:
10.1103/PhysRevLett.89.237203
PACS:
75.30.Vn, 68.47.Gh, 71.30.+h
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