scholarly journals Fermi liquid without quasiparticles and the electron spectral functions of two-dimensional high-Tc superconductors

2002 ◽  
Vol 312-313 ◽  
pp. 506-508 ◽  
Author(s):  
Victor Khodel ◽  
Mikhail Zverev
Keyword(s):  
Fermi Liquid ◽  
Two Dimensional ◽  
High Tc Superconductors ◽  
Spectral Functions ◽  
High Tc

TWO-DIMENSIONAL ANTIFERROMAGNETIC ORDERING IN HIGH-Tc SUPERCONDUCTORS WITH LOW OXYGEN CONTENT

1989 ◽  
Vol 03 (05) ◽  
pp. 711-717 ◽  
Author(s):  
YU. T. PAVLUKHIN ◽  
N. G. HAINOVSKY ◽  
YA. YA. MEDIKOV ◽  
A. I. RYKOV
Keyword(s):  
Oxygen Content ◽  
Two Dimensional ◽  
Low Oxygen ◽  
High Tc Superconductors ◽  
High Tc ◽  
Antiferromagnetic Ordering

HIGH Tc SUPERCONDUCTIVITY: A MODEL BASED ON ANTIFERROMAGNETIC FLUCTUATIONS

1987 ◽  
Vol 01 (03n04) ◽  
pp. 1089-1096
Author(s):  
D. Schmeltzer
Keyword(s):  
Free Energy ◽  
High Temperature ◽  
Low Temperature ◽  
Fermi Liquid ◽  
Antiferromagnetic Interaction ◽  
Two Dimensional ◽  
Fractional Statistics ◽  
Bose Statistic ◽  
High Tc ◽  
High Tc Superconductivity

The system X–La–Cu–O is described as a Fermi liquid with antiferromagnetic interaction. This interaction gives rise to two types of fluctuations, magnetic and superconducting. As a result, we find a free energy which contains two order parameters which at high temperature give rise to superconductivity and at low temperature to reentry-like paramagnetism. For two-dimensional systems, topological effects give rise to fractional statistics and as a result superconductivity appears when the topological angle θ gives rise to a Bose statistic.

Annealing of tweed microstructure in high Tc superconductors in the presence of impurities

1995 ◽  
Vol 10 (8) ◽  
pp. 1864-1871 ◽  
Author(s):  
K. Parlinski ◽  
Y. Watanabe ◽  
K. Ohno ◽  
Y. Kawazoe
Keyword(s):  
Low Temperature ◽  
Domain Walls ◽  
Nearest Neighbor ◽  
Oxygen Deficit ◽  
Two Dimensional ◽  
Dimensional Model ◽  
High Tc Superconductors ◽  
High Tc ◽  
Large Coupling ◽  
Linear Chains

A two-dimensional model of oxygen-deficit layer of superconducting material YBa2Cu3O7 has been simulated by the molecular-dynamics technique in order to study the influence of the impurities in the site of copper on the low-temperature microstructure. The microstructure pattern arises as a result of quenching the system from a high-temperature tetragonal phase to the low-temperature orthorhombic one and subsequent annealing. The potential of the impurity is modified in such a way that it promotes occupation of opposite nearest-neighbor sites around impurity by an oxygen and vacancy simultaneously. The simulations of the annealing processes showed that the domain pattern becomes very tiny with increased concentration of randomly distributed impurities. Domains of larger sizes would appear if the impurities were able to diffuse to the domain walls. This is confirmed by annealing the sample containing linear chains of impurities. The tweed microstructure depends on the magnitude of the force constants of the elastic subsystem, and at too large coupling the randomly distributed impurities are not able to pin the stiff domain walls. The results resemble the electron-microscope photographs made for cobalt in YBa2(Cu1−xCox)3O7−δ.

Electronic Picture in the Normal States of High-Tc Superconductors: From the Optical Viewpoint

1989 ◽  
Vol 156 ◽  
Author(s):  
S. Tajima
Keyword(s):  
Liquid Metal ◽  
Frequency Spectrum ◽  
High Frequency ◽  
Fermi Liquid ◽  
Low Frequency ◽  
High Tc Superconductors ◽  
High Tc ◽  
Electronic Model ◽  
Normal States ◽  
Highly Correlated

ABSTRACTThe specific features of the optical spectra in the high-Tc Cu-oxides are discussed. The low-frequency spectral behavior can be explained by the highly correlated electronic model, whereas in the high-frequency spectrum the behavior of the Fermi liquid metal shows up.

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