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Title: Colossal positive magnetoresistance in surface-passivated oxygen-deficient strontium titanite
Authors: David, Adrian
Tian, Yufeng
Yang, Ping
Gao, Xingyu
Lin, Weinan
Shah, Amish B.
Zuo, Jian-Min
Prellier, Wilfrid
Wu, Tom
Keywords: DRNTU::Science::Physics
Issue Date: 2015
Source: David, A., Tian, Y., Yang, P., Gao, X., Lin, W., Shah, A. B., et al. (2015). Colossal positive magnetoresistance in surface-passivated oxygen-deficient strontium titanite. Scientific reports, 5, 10255-.
Series/Report no.: Scientific Reports
Abstract: Modulation of resistance by an external magnetic field, i.e. magnetoresistance effect, has been a long-lived theme of research due to both fundamental science and device applications. Here we report colossal positive magnetoresistance (CPMR) (>30,000% at a temperature of 2 K and a magnetic field of 9 T) discovered in degenerate semiconducting strontium titanite (SrTiO3) single crystals capped with ultrathin SrTiO3/LaAlO3 bilayers. The low-pressure high-temperature homoepitaxial growth of several unit cells of SrTiO3 introduces oxygen vacancies and high-mobility carriers in the bulk SrTiO3, and the three-unit-cell LaAlO3 capping layer passivates the surface and improves carrier mobility by suppressing surface-defect-related scattering. The coexistence of multiple types of carriers and inhomogeneous transport lead to the emergence of CPMR. This unit-cell-level surface engineering approach is promising to be generalized to others oxides, and to realize devices with high-mobility carriers and interesting magnetoelectronic properties.
ISSN: 2045-2322
DOI: 10.1038/srep10255
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
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