Epitaxial multilayers, consisting of a PrBa2Cu3O7-x buffer layer, ultrathin YBa2Cu3O7-x and SrTiO3, have been grown for application in electric field effect devices. Different analytical techniques indicate a sharp interface between the layers and good dielectric properties of the SrTiO3-layer. First measurements show clear modification of the superconductor's current-voltage characteristics upon applying electric fields of 0.1-1 MV/cm.
Joosse, K., Boguslavskij, Y. M., Gerritsma, G. J., & Rogalla, H. (1993). Multilayers for high Tc superconducting electric field effect devices. Journal of alloys and compounds, 195, 723-726. https://doi.org/10.1016/0925-8388(93)90839-F