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Phys Rev Lett. 2011 Sep 30;107(14):146802. Epub 2011 Sep 28.

Metal-insulator transition in SrTiO(3-x) thin films induced by frozen-out carriers.

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NUSNNI-Nanocore, National University of Singapore, 117542 Singapore.


We report optical, electrical and magnetotransport properties of oxygen deficient SrTiO(3) (SrTiO(3-x)) thin films fabricated by pulsed laser deposition technique. The oxygen vacancies (O(vac)) in the thin film are expected to be uniform. By comparing its electrical properties to those of bulk SrTiO(3-x), it was found that O(vac) in bulk SrTiO(3-x) is far from uniform over the whole material. The metal-insulator transition (MIT) observed in the SrTiO(3-x) film was found to be induced by the carrier freeze-out effect. The low temperature frozen state can be reexcited by Joule heating, electric and intriguingly magnetic field.

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