论文标题
非线性晶格耦合引起的充电顺序纹理以半掺杂的锰矿
Charge order textures induced by non-linear lattice coupling in a half-doped manganite
论文作者
论文摘要
将强烈相互作用的电子自组织成许多量子材料的特性。这些电子在超晶格中的排列方式如何决定损坏的对称性以及稳定哪些基态。在这里，我们表明，低温扫描传输电子显微镜可以在模型充电订购的系统ND $ _ {1/2} $ sr $ _ {1/2} $ mno $ $ $ $ _ {3} $中直接在模型收费的系统ND $ _ {1/2} $ _ {1/2} $ _ {1/2} $ _ {3} $中直接映射本地对称和订单。除了成像典型的以场地为中心的电荷顺序外，我们还发现了外来中间状态的纳米级共存，该状态混合了位点，粘结顺序，并打破反转对称性。我们进一步表明，不同晶格模式的非线性耦合控制着竞争基态之间的选择。结果证明了晶格耦合对于理解和操纵电子自组织特征的重要性，并突出了一种在广泛相关的系统中探测局部秩序的新方法。
The self-organization of strongly interacting electrons into superlattice structures underlies the properties of many quantum materials. How these electrons arrange within the superlattice dictates what symmetries are broken and what ground states are stabilized. Here we show that cryogenic scanning transmission electron microscopy enables direct mapping of local symmetries and order at the intra-unit-cell level in the model charge-ordered system Nd$_{1/2}$Sr$_{1/2}$MnO$_{3}$. In addition to imaging the prototypical site-centered charge order, we discover the nanoscale coexistence of an exotic intermediate state which mixes site and bond order and breaks inversion symmetry. We further show that nonlinear coupling of distinct lattice modes controls the selection between competing ground states. The results demonstrate the importance of lattice coupling for understanding and manipulating the character of electronic self-organization and highlight a novel method for probing local order in a broad range of strongly correlated systems.
