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Long-ranged Cu-based order with $$d_{z^2}$$ orbital character at a YBa2Cu3O7/ manganite interface

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Gaina Roxana, Nicholson Christopher W., Rumo Maxime, Sarkar Subhrangsu, Khmaladze Jarji, Paris Eugenio, Tseng Yi, Zhang Wenliang, Asmara Teguh C., McNally Daniel, Piamonteze Cinthia, Weschke Eugen, Schmitt Thorsten, Monney Claude, Bernhard Christian,
Project Electron-Phonon Interactions in Rare-Earth Nickelates and Superconducting Cuprates
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Original article (peer-reviewed)

Journal npj Quantum Materials
Volume (Issue) 6(1)
Page(s) 12 - 12
Title of proceedings npj Quantum Materials
DOI 10.1038/s41535-021-00311-y

Open Access

Type of Open Access Publisher (Gold Open Access)


Abstract The interplay of nearly degenerate orders in quantum materials can lead to a myriad of emergent phases. A prominent case is that of the high- Tc cuprates for which the relationship between superconductivity and a short-ranged, incommensurate charge density wave in the CuO 2 planes involving the $$d_{x^2 - y^2}$$dx2−y2 orbitals (Cu-CDW) is a subject of great current interest. Strong modifications of the strength and coherence of this Cu-CDW have been achieved by applying large magnetic fields, uniaxial pressure, or via the interfacial coupling in cuprate/manganite multilayers. However, such modifications do not alter the dominant orbital character. Here we investigate cuprate/manganite multilayers with resonant inelastic X-ray scattering (RIXS) and show that a new kind of Cu-based density wave order can be induced that has not been previously observed in the cuprates. This order has an unusually small in-plane wave vector in the range of Q|| < 0.1 reciprocal lattice units (r.l.u.), a large correlation length of about 40 nm, and a predominant $$d_{z^2}$$dz2 orbital character, instead of the typical $$d_{x^2 - y^2}$$dx2−y2 one. Its appearance is determined by the hole doping of the manganite which is a key parameter controlling the interfacial charge transfer and orbital reconstruction. We anticipate that the observation of a previously unknown type of density wave order at the YBCO interface will allow for fresh perspectives on the enigmatic relation between superconductivity and charge order (CO) in the cuprates.