Ca2-xNaxCuO2Cl2中的节点准粒子与反节点电荷有序化

Nodal quasiparticles and antinodal charge ordering in Ca2-xNaxCuO2Cl2.

作者信息

Shen Kyle M, Ronning F, Lu D H, Baumberger F, Ingle N J C, Lee W S, Meevasana W, Kohsaka Y, Azuma M, Takano M, Takagi H, Shen Z-X

机构信息

Departments of Applied Physics, Physics, and Stanford Synchrotron Laboratory, Stanford University, Stanford, CA 94305, USA.

出版信息

Science. 2005 Feb 11;307(5711):901-4. doi: 10.1126/science.1103627.

DOI:10.1126/science.1103627

PMID:15705845

Abstract

Understanding the role of competing states in the cuprates is essential for developing a theory for high-temperature superconductivity. We report angle-resolved photoemission spectroscopy experiments which probe the 4a0 x 4a0 charge-ordered state discovered by scanning tunneling microscopy in the lightly doped cuprate superconductor Ca2-xNaxCuO2Cl2. Our measurements reveal a marked dichotomy between the real- and momentum-space probes, for which charge ordering is emphasized in the tunneling measurements and photoemission is most sensitive to excitations near the node of the d-wave superconducting gap. These results emphasize the importance of momentum anisotropy in determining the complex electronic properties of the cuprates and places strong constraints on theoretical models of the charge-ordered state.

摘要

了解竞争态在铜酸盐中的作用对于发展高温超导理论至关重要。我们报告了角分辨光电子能谱实验，该实验探测了在轻掺杂铜酸盐超导体Ca2-xNaxCuO2Cl2中通过扫描隧道显微镜发现的4a0×4a0电荷有序态。我们的测量揭示了实空间和动量空间探针之间的显著二分法，在隧道测量中电荷有序被强调，而光电子能谱对d波超导能隙节点附近的激发最为敏感。这些结果强调了动量各向异性在确定铜酸盐复杂电子性质方面的重要性，并对电荷有序态的理论模型施加了严格限制。