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Intrinsic Inhomogeneities in Manganite Thin Films Investigated with Scanning Tunneling Spectroscopy

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arxiv cond-mat/0212144 v1 pith:QGVDZCK3 submitted 2002-12-06 cond-mat.str-el cond-mat.mtrl-sci

T. Becker , C. Streng , Y. Luo , V. Moshnyaga , B. Damaschke , Nic Shannon , K. Samwer This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords tunnelingdomainstransitionfilmsinhomogeneitiesintrinsicscanningspectroscopy
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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.

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