Vacancy induced metallicity at the CaHfO3/SrTiO3 interface

Density functional theory is used to study the electronic properties of the oxide heterointerfaceCaHfO3/SrTiO3. Structural relaxation is carried out with and without O vacancies. As compared to related interfaces, strongly reduced octahedral distortions are found. Stoichiometric interfaces between the wide band gap insulatorsCaHfO3 and SrTiO3 turn out to exhibit an insulating state. However, interface metallicity is introduced by O vacancies, in agreement with experiment. The reduced octahedral distortions and necessity of O deficiency indicate a less complicated mechanism for the creation of the interfacial electron gas.

Nazir S, Pulikkotil JJ, Singh N, Schwingenschlögl U (2011) Vacancy induced metallicity at the CaHfO[sub 3]/SrTiO[sub 3] interface. Appl Phys Lett 98: 133114. doi:10.1063/1.3573808.

AIP Publishing

Applied Physics Letters


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