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首页> 外文期刊>Npj Quantum Materials >Long-ranged Cu-based order with $$d_{z^2}$$ d z 2 orbital character at a YBa2Cu3O7/ manganite interface
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Long-ranged Cu-based order with $$d_{z^2}$$ d z 2 orbital character at a YBa2Cu3O7/ manganite interface

机译：yba2cu3o7 / manganite接口$$ d_ {z ^ 2} $$ d_ {z ^ 2} $$ d z 2轨道字符

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摘要

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.
机译：量子材料中几乎简并订单的相互作用可以导致无数的紧急阶段。突出的情况是高TC铜替乳酸铜，其中超导性和短传出的关系，CUO2平面中的短传，不加密的电荷密度波在涉及$$ D_ {x ^ 2 - y ^ 2} $$轨道（CU -cdw）是当前兴趣的主题。通过施加大磁场，单轴压力或通过铜酸铜/锰铁多层多层的界面偶联来实现该Cu-CDW的强度和相干性的强调。然而，这种修改不会改变主导的轨道特征。在这里，我们研究了具有共振非弹性X射线散射（RIX）的铜酸酯/锰铁多层，并且表明可以在铜替物蛋白中尚未观察到尚未观察到的新种类的Cu基密度波顺序。此订单在Q ||的范围内具有异常小的面内波向量<0.1互易晶格单位（RLU），大的相关长度约为40 nm，而且是一个主要的$$ d_ {z ^ 2} $$轨道字符，而不是典型的$$ d_ {x ^ 2 - y ^ 2} $$。它的外观由锰铁的空穴掺杂决定，该锰矿是控制界面电荷转移和轨道重建的关键参数。我们预期在YBCO接口处观察以前未知的密度波顺序，将允许新的透视铜酸盐中超导和充电阶（CO）之间的神秘关系。

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