Abstract
Correlated electron materials can undergo a variety of phase transitions, including superconductivity, the metal–insulator transition and colossal magnetoresistance1. Moreover, multiple physical phases or domains with dimensions of nanometres to micrometres can coexist in these materials at temperatures where a pure phase is expected2. Making use of the properties of correlated electron materials in device applications will require the ability to control domain structures and phase transitions in these materials. Lattice strain has been shown to cause the coexistence of metallic and insulating phases in the Mott insulator VO2. Here, we show that we can nucleate and manipulate ordered arrays of metallic and insulating domains along single-crystal beams of VO2 by continuously tuning the strain over a wide range of values. The Mott transition between a low-temperature insulating phase and a high-temperature metallic phase usually occurs at 341 K in VO2, but the active control of strain allows us to reduce this transition temperature to room temperature. In addition to device applications, the ability to control the phase structure of VO2 with strain could lead to a deeper understanding of the correlated electron materials in general.
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Acknowledgements
This work was supported in part by the National Science Foundation (grant no. EEC-0425914) and in part by the Laboratory Directed Research and Development Program of Lawrence Berkeley National Laboratory (LBNL; Department of Energy contract no. DE-AC02-05CH11231). Portions of this work were performed at the Molecular Foundry and the National Centre for Electron Microscopy, both at LBNL. J.C.G. and E.E. acknowledge funding by the Focus Center Research Program on Materials, Structures and Devices (FCRP/MSD).
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J.W. and J.C. conceived and planned the experiments. J.C. performed the experiments with assistance from W.F. E.E., V.S. and J.C.G. carried out the modelling. H.Z. performed the TEM. S.H., J.W.L.Y., D.R.K. and D.F.O. contributed to materials synthesis and analysis. J.C. and J.W. analysed the data and wrote the paper.
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Cao, J., Ertekin, E., Srinivasan, V. et al. Strain engineering and one-dimensional organization of metal–insulator domains in single-crystal vanadium dioxide beams. Nature Nanotech 4, 732–737 (2009). https://doi.org/10.1038/nnano.2009.266
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DOI: https://doi.org/10.1038/nnano.2009.266
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