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X. T. Li1, S. J. Tu2, L. Chaix3, C. Fawaz3, M. d’Astuto3, X. Li1, F. Yakhou-Harris4, K. Kummer4, N. B. Brookes4, M. Garcia-Fernandez5, Ke-Jin Zhou5, Z. F. Lin2, J. Yuan2, K. Jin2, M. P. M. Dean6, and X. Liu1,7,* 1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China 2Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 3Univ.
Abstract Bulk charge density waves are now reported in nearly all high-temperature superconducting cuprates, with the noticeable exception of one particular family: the copper oxychlorides. Here, we used resonant inelastic x-ray scattering to reveal a bulk charge density waves in these materials.
High-temperature copper oxide superconductors consist of stacked CuO planes, with electronic band structures and magnetic excitations that are primarily two-dimensional1,2, but with superconducting coherence that is three-dimensional. This dichotomy highlights the importance of out-of-plane charge dynamics, which has been found to be incoherent in the normal state3,4 within the limited range of momenta accessible by optics.
With sufficient energy resolution, resonant inelastic X-ray scattering (RIXS) can be an ideal probe for revealing the CDW excitations in cuprates. By tuning the incident photon energy to the Cu L -edge (Fig. 1a), the resonant absorption and emission processes can leave the system in excited final states, which couple to a variety of excitations arising from orbital, spin, charge, and lattice degrees of freedom15.
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