Commensurate and incommensurate checkerboard charge ordered states

• Published in: Physica. C, Superconductivity Vol. 460; no. 2; pp. 1178 - 1179
• Main Authors: Reichhardt, C., Reichhardt, C.J. Olson, Bishop, A.R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-09-2007; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic structure; Exact sciences and technology; Physics; Properties of type I and type II superconductors; Superconductivity; Commensurate-incommensurate transformations; Valence; Charge ordering; Tunnel effect; High-Tc superconductors; Charged particles; Coulomb interaction; Repulsion interaction
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2007.03.419

We consider a system of charged particles interacting through Coulomb repulsion with an additional short range attraction to model charge ordering in cuprate superconductors. The particles move over a background periodic substrate. In the absence of the substrate, we find a checkerboard type ordering of the charges along with a variety of other crystalline states as the charge density is varied. In the presence of a substrate, there are additional commensurate–incommensurate grain boundary structures that form within the checkerboard state. We compare our results to recent scanning tunneling experiments.