Correlated band structure and the ground-state phase diagram in high- cuprates

✍ Scribed by Werner Hanke; Markus Aichhorn; Enrico Arrigoni; Michael Potthoff

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 176 KB
• Volume: 378-380
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2006.01.139

✦ Synopsis

We review results obtained with a recently proposed variational cluster approach (VCA) for the competition between d-wave superconductivity (dSC) and antiferromagnetism (AF) in the high-T C cuprates. Comparing the single-particle spectra of a twodimensional Hubbard model with quantum Monte-Carlo (QMC) and experimental data, we verify that the VCA correctly treats the lowenergy excitations. The cluster calculations reproduce the overall ground-state phase diagram of the high-temperature superconductors both for electron-and hole-doping. In particular, they include salient features such as the enhanced robustness of the AF state in case of electron doping. For electron-but also for hole-doping, we clearly identify a tendency to phase separation into a mixed AF-dSC phase at low and a pure dSC-phase at high doping.