Intrinsic inhomogeneities in manganite thin films investigated with scanning tunneling spectroscopy |
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Authors: | Becker T Streng C Luo Y Moshnyaga V Damaschke B Shannon N Samwer K |
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Institution: | I. Physikalisches Institut, Universitaet Goettingen, Bunsenstrasse 9, 37073 Goettingen, Germany. |
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Abstract: | 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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