Low-Temperature Resistance Anomaly at SrTiO3 Grain Boundaries: Evidence for an Interface-Induced Phase Transition

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Shao, Rui
Chisholm, Matthew F
Duscher, Gerd
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Variable temperature transport between 1.4 and 300 K, structural imaging, and theoretical calculations were used to characterize the properties of electrically active 24º and 36.8º [001] tilt SrTiO3 grain boundaries with 0.1 at.% niobium doping. An anomaly in boundary resistance and capacitance characteristics typical of a positive temperature coefficient effect is observed. This behavior is indicative of interface-induced dipole ordering. The detailed atomic structures of these grain boundaries were determined from a comparison of ab initio calculations and Z-contrast TEM images. The number of excess electrons at the boundaries determined experimentally and theoretically agrees and is associated with the boundary structural units.

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2005-11-04
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Copyright American Physical Society. Reprinted from Physical Review Letters, Volume 95, Issue 19, Article 197601, November 4, 2005, 4 pages. Publisher URL: http://dx.doi.org/10.1103/PhysRevLett.95.197601
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