scholarly journals Effect of the Fermi surface reconstruction on the self-energy of the copper-oxide superconductors

2014 ◽  
Vol 506 ◽  
pp. 109-114
Author(s):  
B. Bellafi ◽  
M. Azzouz ◽  
S. Charfi-Kaddour
Keyword(s):  
Fermi Surface ◽  
Copper Oxide ◽  
Surface Reconstruction ◽  
The Self ◽  
Oxide Superconductors ◽  
Self Energy ◽  
Copper Oxide Superconductors ◽  
Fermi Surface Reconstruction

SINGLE-PARTICLE AND OPTICAL EXCITATIONS IN DOPED MOTT- HUBBARD INSULATORS

1992 ◽  
Vol 06 (05n06) ◽  
pp. 589-602 ◽  
Author(s):  
WALTER STEPHAN ◽  
PETER HORSCH
Keyword(s):  
Optical Properties ◽  
Band Structure ◽  
Fermi Surface ◽  
Copper Oxide ◽  
Hubbard Model ◽  
Optical Conductivity ◽  
Single Particle ◽  
Oxide Superconductors ◽  
Two Dimensional ◽  
Copper Oxide Superconductors

Recent numerical results for the single-particle spectral function and optical conductivity of the two-dimensional Hubbard and t−J models are reviewed. Already for two holes in systems of sixteen to twenty sites (≥ 10% doping) a large electronic Fermi surface, compatible with Luttinger’s theorem, is observed. The full single-particle Green’s function is examined, and is shown to exhibit quasiparticle-like behavior, with dispersion consistent with the band structure of the non-interacting limit, and band width scaling approximately as J for J smaller than t. The optical conductivity of the Hubbard and t−J models is shown to have many features in common with recent experiments on copper oxide superconductors. The importance of the often neglected 3-site terms which arise in the derivation of the t−J model from the Hubbard model for optical properties is discussed.

scholarly journals Fragile charge order in the nonsuperconducting ground state of the underdoped high-temperature superconductors

2015 ◽  
Vol 112 (31) ◽  
pp. 9568-9572 ◽  
Author(s):  
B. S. Tan ◽  
N. Harrison ◽  
Z. Zhu ◽  
F. Balakirev ◽  
B. J. Ramshaw ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Fermi Surface ◽  
Copper Oxide ◽  
High Temperature Superconductors ◽  
Field Enhancement ◽  
Charge Order ◽  
Quantum Oscillation ◽  
Oxide Superconductors ◽  
Spectroscopic Techniques ◽  
Copper Oxide Superconductors

The normal state in the hole underdoped copper oxide superconductors has proven to be a source of mystery for decades. The measurement of a small Fermi surface by quantum oscillations on suppression of superconductivity by high applied magnetic fields, together with complementary spectroscopic measurements in the hole underdoped copper oxide superconductors, point to a nodal electron pocket from charge order in YBa2Cu3O6+δ. Here, we report quantum oscillation measurements in the closely related stoichiometric material YBa2Cu4O8, which reveals similar Fermi surface properties to YBa2Cu3O6+δ, despite the nonobservation of charge order signatures in the same spectroscopic techniques, such as X-ray diffraction, that revealed signatures of charge order in YBa2Cu3O6+δ. Fermi surface reconstruction in YBa2Cu4O8 is suggested to occur from magnetic field enhancement of charge order that is rendered fragile in zero magnetic fields because of its potential unconventional nature and/or its occurrence as a subsidiary to more robust underlying electronic correlations.

Fermi-surface reconstruction close to a pressure-induced metal-insulator transition

2004 ◽  
Vol 114 ◽  
pp. 277-281 ◽  
Author(s):  
J. Wosnitza ◽  
J. Hagel ◽  
O. Stockert ◽  
C. Pfleiderer ◽  
J. A. Schlueter ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Surface Reconstruction ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Fermi Surface Reconstruction

Correlation in Metallic Copper Oxide Superconductors: How Large is it?

1990 ◽  
pp. 463-473
Author(s):  
W. E. Pickett ◽  
H. Krakauer ◽  
R. E. Cohen ◽  
D. Singh ◽  
D. A. Papaconstantopoulos
Keyword(s):  
Copper Oxide ◽  
Metallic Copper ◽  
Oxide Superconductors ◽  
Copper Oxide Superconductors
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