Magnetic and conductive dead layer at the La0.67Ca0.33MnO3–SrTiO3:Nb interface

Liang, S.; Sun, J. R.; Wang, J.; Shen, B. G.
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p182509
Academic Journal
Interfacial properties of the La0.67Ca0.33MnO3 films grown on SrTiO3 and SrTiO3:Nb, respectively, have been experimentally studied. An interface layer, ∼13 or ∼4.4 nm for the films on SrTiO3 or SrTiO3:Nb, with degenerated magnetic/conductive properties is found in the film. The most remarkable result is the significantly different layer width on different substrates. The built-in electric field yielded by charge exchange may be responsible for the layer shrinkage in La0.67Ca0.33MnO3/SrTiO3:Nb. A depression of this layer by magnetic field is also observed and ascribed to field-induced enhancement of the double exchange between Mn ions.


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