The Importance of Different Two-Dimensional Plasmon Branches for High Tc Superconductors

1987 ◽  
pp. 445-449 ◽  
Author(s):  
V. Z. Kresin ◽  
H. Morawitz
Keyword(s):  
Two Dimensional ◽  
High Tc Superconductors ◽  
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

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.

TWO-DIMENSIONAL BEHAVIOUR OF LAYERED HIGH-Tc SUPERCONDUCTORS

1992 ◽  
Vol 06 (07) ◽  
pp. 367-382 ◽  
Author(s):  
S. N. ARTEMENKO ◽  
Yu. I. LATYSHEV
Keyword(s):  
Critical Temperature ◽  
Layered Structure ◽  
Mean Field ◽  
Superconducting Films ◽  
Two Dimensional ◽  
Bulk Crystals ◽  
High Tc Superconductors ◽  
High Tc ◽  
Bkt Transition ◽  
2D Superconductors

High-T c superconductors (HTSs) have a layered structure, which strongly affects their physics. Bulk crystals exhibit the two-dimensional (2D) behaviour typical for superconducting films of atomic thickness. Fluctuation contribution to conductivity above mean-field critical temperature T c0 is characteristic to 2D superconductors. Finite resistivity in layered HTSs appears above Berezinskii-Kosterlitz-Thouless (BKT) transition T c , which is by several degrees smaller than T c0 . Below T c power-law I-V curves are observed. The transition and its main manifestations are described as a result of thermal creation of 2D-vortices with cores residing inside single superconducting layers. Magnetoresistive effects near the BKT transition are discussed briefly.

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