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Mean-field analysis of intra-unit-cell order in the Emery model of the CuO2 plane.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Oct2011, Vol. 84 Issue 14, p144502-1-144502-10. 10p. - Publication Year :
- 2011
-
Abstract
- Motivated by recent experiments on high-Tc cuprate superconductors pointing toward intra-unit-cell (IUC) order in the pseudogap phase, we investigate three distinct intra-unit-cell-ordering possibilities: nematic, nematic-spin- nematic, and current-loop order. The first two are Fermi-surface instabilities involving a spontaneous charge and magnetization imbalance between the two oxygen sites in the unit cell, respectively, while the third describes circulating currents within the unit cell. We analyze the three-band Emery model of a single CuO2 layer including various on-site and nearest-neighbor interactions within a self-consistent mean-field approach. We show how these on-site and further-neighbor repulsions suppress or enhance particular IUC orders. In particular, we show that the attractive interactions necessary for nematic and nematic-spin-nematic orders in one-band models have their natural microscopic origin in the O-O on-site and nearest-neighbor repulsions in the three-band model. Finally, we find that while the nematic and nematic-spin-nematic orders cannot coexist in this framework, the loop-current order can coexist with nematic order. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPERCONDUCTORS
*FERMI surfaces
*MAGNETIZATION
*OXYGEN
*PHASE diagrams
Subjects
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 84
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 70091477
- Full Text :
- https://doi.org/10.1103/PhysRevB.84.144502