In situ characterization of strontium surface segregation in epitaxial La0.7Sr0.3MnO3 thin films as a function of oxygen partial pressure

Fister, Tim T.; Fong, Dillon D.; Eastman, Jeffrey A.; Baldo, Peter M.; Highland, Matthew J.; Fuoss, Paul H.; Balasubramaniam, Kavaipatti R.; Meador, Joanna C.; Salvador, Paul A.
October 2008
Applied Physics Letters;10/13/2008, Vol. 93 Issue 15, p151904
Academic Journal
Using in situ synchrotron measurements of total reflection x-ray fluorescence, we find evidence of strontium surface segregation in (001)-oriented La0.7Sr0.3MnO3 thin films over a wide range of temperatures (25–900 °C) and oxygen partial pressures (pO2=0.15–150 Torr). The strontium surface concentration is observed to increase with decreasing pO2, suggesting that the surface oxygen vacancy concentration plays a significant role in controlling the degree of segregation. Interestingly, the enthalpy of segregation becomes less exothermic with increasing pO2, varying from -9.5 to -2.0 kJ/mol. In contrast, the La0.7Sr0.3MnO3 film thickness and epitaxial strain state have little impact on segregation behavior.


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