Almost three decades years after the discovery of high-temperature superconductivity in the copper oxides, new experimental techniques such as resonant x-ray scattering are yielding surprising new insights [1]. After outlining our current understanding of high-temperature superconductivity, we will discuss the latest developments with a focus on the discovery of charge order and its interplay with superconductivity in the copper oxides [2]. We will also discuss perspectives for controlled manipulation of superconductivity at interfaces [3].

[1] For a recent review, see B. Keimer et al., Nature 518, 179 (2015).
[2] G. Ghiringhelli et al., Science 337, 821 (2012); S. Blanco-Canosa et al., Phys. Rev. Lett. 110, 187001 (2013); Phys. Rev. B 90, 054513 (2014); M. Le Tacon et al., Nature Phys. 10, 52 (2014); R. Comin et al., Science 343, 390 (2014); Nature Mater. 14, 796 (2015).
[3] N. Driza et al., Nature Mater.11, 675 (2012); S. Heinze et al., Appl. Phys. Lett. 101, 131603 (2012); A. Frano et al., submitted.