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 CuO2 planes involving the d_{x^2 - y^2} 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} orbital character, instead of the typical d_{x^2 - y^2} 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.
Highlights
The complex phase diagram of the cuprate high-Tc superconductors is a prime example of the varied properties of strongly correlated quantum materials that arise from competing orders and nearly degenerate ground states[1]
Our observations provide insights into the interfacial coupling between the Mn- and Cu-based charge and ism remains to be established, is seems likely that the concomitant magnetic orders, and they suggest a new route to induce coupled induced Cu-CDW order in the YBCO layer quantum states in these cuprate/manganite multilayers
The present work emphasizes the range of ordered phases that develop in the high-Tc cuprates, and, in particular, suggests that these can be induced to involve the out-of-plane orbitals, in contrast to previous observations
Summary
The complex phase diagram of the cuprate high-Tc superconductors is a prime example of the varied properties of strongly correlated quantum materials that arise from competing orders and nearly degenerate ground states[1]. Relevant are the electric field complete reversal compared with previous reports of dx2Ày2 order[10,16], where σ-polarization shows the strongest signal This component of the X-ray beams with respect to the scattering suggests that the behavior underlying the newly observed Bragg plane (π or σ polarization), and the incident angle of the beam peak corresponds to a different orbital symmetry than in previous with respect to the sample surface In the supplementary materials (Supplementary Note 4 and Supplementary Fig. 3), we present comparisons between additional orbital symmetries and the observed geometric dependence These reveal that dz[2] orbitals with spins pointing along either [001] or [110] can reproduce the reversed cross-section behavior with respect to Resonant elastic X-ray scattering (REXS) study of the Bragg peak at x = 0.5. They have been explained in terms of a transfer of electrons from the manganite to the YBCO and an orbital
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