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-T_c 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.

量子材料中几乎简并的有序相互作用会导致无数相的出现。一个突出的例子是高T _c铜酸盐，其超导电性与CuO ₂平面中涉及\（d_ {x ^ 2-y ^ 2} \）的短距离，不相称的电荷密度波之间的关系。轨道（Cu-CDW）是当前引起人们极大关注的主题。通过施加大的磁场，单轴压力或通过铜酸盐/锰酸盐多层中的界面耦合，已实现了对该Cu-CDW强度和相干性的强烈改进。但是，这样的修改不会改变主要的轨道特征。在这里，我们用共振非弹性X射线散射（RIXS）研究了铜酸盐/锰矿的多层结构，并表明可以诱导出一种新的基于铜的密度波阶，而以前在铜酸盐中并未观察到这种波动。该阶在Q _||的范围内具有异常小的平面波矢量。 <0.1倒易晶格单位（rlu），大的相关长度约40 nm和主要的\（d_ {z ^ 2} \）轨道字符，而不是典型的\（d_ {x ^ 2-y ^ 2} \）。它的外观是由锰的空穴掺杂决定的，锰是控制界面电荷转移和轨道重构的关键参数。我们预计，在YBCO界面上观察到以前未知类型的密度波阶将为铜酸盐中超导性和电荷阶数（CO）之间的神秘关系提供新的视角。