Charge order in the pseudogap phase of cuprate superconductors

Charge ordering instabilities are studied in a multiorbital model of cuprate superconductors. A known, key feature of this model is that the large local Coulomb interaction in the Cu orbitals generates local moments with short range antiferromagnetic (AF) correlations. The strong simplifying ansatz...

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Bibliographic Details
Published in:New journal of physics 2015-01, Vol.17 (1), p.13025-14
Main Authors: Atkinson, W A, Kampf, A P, Bulut, S
Format: Article
Language:English
Subjects:
74.20.-z
74.72.Kf
Antiferromagnetism
Brillouin zones
Charge
Charge density
charge order
Charge transfer
COPPER OXIDE
Cuprates
DENSITY
Fermi surfaces
high temperature superconductors
Instability
MAGNETIC PROPERTIES
Modulation
nematicity
Orbitals
Periodic variations
PHASES
Physics
pseudogap
Reconstruction
SUPERCONDUCTORS
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Summary:Charge ordering instabilities are studied in a multiorbital model of cuprate superconductors. A known, key feature of this model is that the large local Coulomb interaction in the Cu orbitals generates local moments with short range antiferromagnetic (AF) correlations. The strong simplifying ansatz that these moments are static and ordered allows us to explore a regime not generally accessible to weak-coupling approaches. The AF correlations lead to a pseudogap-like reconstruction of the Fermi surface. We find that the leading charge instability within this pseudogap-like state is to a phase with a spatially modulated transfer of charge between neighbouring oxygen px and py orbitals accompanied by weak modulations of the charge density on the Cu orbitals. As a prime result of the AF Fermi-surface reconstruction, the wavevectors of the charge modulations are oriented along the crystalline axes with a periodicity that agrees quantitatively with experiments. This suggests a resolution to a discrepancy between experiments, which find axial order, and previous theoretical calculations, which find modulation wavevectors along the Brillouin zone diagonal. The axial order is stabilized by hopping processes via the Cu4s orbital, which is commonly not included in model analyses of cuprate superconductors. The main implication of our results is that charge order emerges from the pseudogap state, and is not the primary source of the pseudogap.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/1/013025