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Science 24 April 2009:
Vol. 324. no. 5926, p. 465
DOI: 10.1126/science.1169018
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Technical Comments

Response to Comment on "Colossal Ionic Conductivity at Interfaces of Epitaxial ZrO2:Y2O3/SrTiO3 Heterostructures"

J. García-Barriocanal,1 A. Rivera-Calzada,1 M. Varela,2 Z. Sefrioui,1 E. Iborra,3 C. Leon,1 S. J. Pennycook,2 J. Santamaría1,*

Guo suggests that the reported ionic conductivity of ZrO2:Y2O3/SrTiO3 heterostructures might be due to the electronic conductivity from the SrTiO3. We point out shortcomings in his reasoning and underscore that our results show that any electronic contribution to the conductance is at least three orders of magnitude lower than the ionic contribution determined by ac methods.

1 Grupo de Física de Materiales Complejos, Universidad Complutense de Madrid, Madrid 28040, Spain.
2 Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
3 Escuela Técnica Superior de Ingenieros de Telecomunicaciones, Universidad Politécnica de Madrid. Madrid 28040, Spain.

* To whom correspondence should be addressed. E-mail: jacsan{at}fis.ucm.es

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Science. ISSN 0036-8075 (print), 1095-9203 (online)