Observation of a Three-Dimensional Quasi-Long-Range Electronic Supermodulation in YBa2Cu3O7-x/La0.7Ca0.3MnO3 Heterostructures
Junfeng He, Padraic Shafer, Thomas R. Mion, Vu Thanh Tra, Qing He, J. Kong, Y. -D. Chuang, W. L. Yang, M. J. Graf, J. -Y. Lin, Y. -H. Chu, E. Arenholz, Rui-Hua He
Recent developments in high-temperature superconductivity highlight a generic tendency of the cuprates to develop competing electronic (charge) supermodulations. While coupled to the lattice and showing different characteristics in different materials, these supermodulations themselves are generally conceived to be quasi-two-dimensional, residing mainly in individual CuO2 planes, and poorly correlated along the c-axis. Here we observed with resonant elastic x-ray scattering a distinct type of electronic supermodulation in YBa2Cu3O7-x (YBCO) thin films grown epitaxially on La0.7Ca0.3MnO3 (LCMO). This supermodulation has a periodicity nearly commensurate with four lattice constants in-plane, eight out-of-plane, with long correlation lengths in three dimensions. It sets in far above the superconducting transition temperature and competes with superconductivity below this temperature for electronic states predominantly in the CuO2 plane. Our finding sheds new light on the nature of charge ordering in cuprates as well as a reported long-range proximity effect between superconductivity and ferromagnetism in YBCO/LCMO heterostructures.
Quasi-1D Planar Magnetic Topological Heterostructure
MIPT（莫斯科物理技术学院）；Abrikosov Center for Theoretical Physics, MIPT（莫斯科物理技术学院阿布里科索夫理论物理中心）；Institute of Physics of DFRS, Russian Academy of Sciences（俄罗斯科学院达吉斯坦共和国科学中心物理研究所）
Phases of Quasi-One-Dimensional Fractional Quantum (Anomalous) Hall - Superconductor Heterostructures
Max-Planck Institute for Solid State Research（马克斯·普朗克固体研究所）；University of Luxembourg（卢森堡大学）；Purdue University（普渡大学）；University of Wisconsin-Madison（威斯康星大学麦迪逊分校）
Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures
我们强调了最近的进展，在[111]取向的过渡金属氧化物薄膜和异质结构，这是出了名的难以实现相比，他们的[001]取向的对应物的强关联和拓扑状态的理论，材料制造和实验表征。我们专注于两类复杂的氧化物，具有化学式ABO 3和A2 B2 O 7，其中B位点被具有局部矩的开壳过渡金属离子占据，A位点通常是稀土。由这些母体复合晶格衍生出的[111]取向准二维晶格可以表现出特殊的几何和对称性，即屈曲的蜂窝晶格，以及kagome和三角晶格。这些晶格基序形成了以奇异磁性、各种形式的轨道有序、拓扑绝缘体、拓扑半金属、量子反常霍尔绝缘体和量子自旋液体表示的突现强关联和拓扑态的基础。对于具有高原子序数的过渡金属离子，自旋-轨道耦合起着重要作用，并且可能在电子能带结构和磁激发光谱中产生额外的拓扑特征。我们通过阐述这一积极发展领域的开放挑战和机遇来结束展望。
