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Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain

Nature volume 394, pages 453–456 (1998)Cite this article

Abstract

The discovery1 of high-temperature superconductivity in copper oxides raised the possibility that superconductivity could be achieved at room temperature. But since 1993, when a critical temperature (T c) of 133 K was observed in the HgBa2Ca2Cu3O8+δ (ref. 2), no further progress has been made in raising the critical temperature through material design. It has been shown, however, that the application of hydrostatic pressure can raise T c — up to ∼164 K in the case of HgBa2Ca2Cu3O8+δ (ref. 3). Here we show, by analysing the uniaxial strain and pressure derivatives of T c, that compressive epitaxial strain in thin films of copper oxide superconductors could in principle generate much larger increases in the critical temperature than obtained by comparable hydrostatic pressures. We demonstrate the experimental feasibility of this approach for the compound La1.9Sr0.1CuO4, where we obtain a critical temperature of 49 K in strained single-crystal thin films — roughly double the bulk value of 25 K. Furthermore, the resistive behaviour at low temperatures (but above T c) of the strained samples changes markedly, going from insulating to metallic.

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Figure 1: Extrapolated in-plane lattice parameters as a function of temperature.
Figure 2: Measured X-ray diffraction pattern of the 12-unit-cell-thick ‘214’ film on SLAO.
Figure 3: Cross-section, high-resolution electron-microscopy image of the ‘214’ film on SLAO.
Figure 4: Resistivity versus temperature for the two films grown simultaneously and for the bulk x = 0.10 sample26.

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Acknowledgements

We thank Y. Jaccard, F. Arrouy and E. J. Williams for contributions in the initial phase of this project; P. Martinoli, Ø. Fischer, J.-M. Triscone, J. G. Bednorz and C. Rossel for discussions; and C. Voisard and T. Maeder for the thermal expansion measurements. This work was supported by the Swiss National Science Foundation, the Swiss Priority Project “Minast”, and the Belgian UIAP 4/10.

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Authors and Affiliations

  1. IBM Research Division, Zurich Research Laboratory, CH-8803, Rüschlikon, Switzerland

    J.-P. Locquet, J. Perret, J. Fompeyrine, E. Mächler & J. W. Seo

  2. Institut de Physique, Université de Neuchâtel, CH-2000, Neuchâtel, Switzerland

    J. Perret & J. W. Seo

  3. Institute of Inorganic Chemistry, University of Bern, CH-3012, Bern>, Switzerland

    J. Fompeyrine

  4. EMAT, RUCA, University of Antwerp, B-2020, Antwerpen, Belgium

    G. Van Tendeloo

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Correspondence to J.-P. Locquet.

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Locquet, JP., Perret, J., Fompeyrine, J. et al. Doubling the critical temperature of La1.9Sr0.1CuO4 using epitaxial strain. Nature 394, 453–456 (1998). https://doi.org/10.1038/28810

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