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

scholarly journals DETERMINATION OF OXYGEN CONTENT IN HIGH Tc SUPERCONDUCTORS BY DEUTERON PARTICLE ACTIVATION ANALYSIS

1993 ◽  
Vol 42 (2) ◽  
pp. 326
Author(s):  
TAO ZHEN-LAN ◽  
D.E. AlBURGER ◽  
K.W. JONES ◽  
Y.D. YAO ◽  
Y.H. KAO
Keyword(s):  
Activation Analysis ◽  
Oxygen Content ◽  
High Tc Superconductors ◽  
High Tc ◽  
Particle Activation

Oxygen content and its related properties of high tc superconductors

1993 ◽  
Vol 1 (3-6) ◽  
pp. 549-557
Author(s):  
Kazuo Fueki ◽  
Yasushi Idemoto
Keyword(s):  
Oxygen Content ◽  
High Tc Superconductors ◽  
High Tc

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.

MAGNETIC AND SUPERCONDUCTING PROPERTIES OF HIGH-Tc SUPERCONDUCTORS

1995 ◽  
Vol 09 (06) ◽  
pp. 633-677 ◽  
Author(s):  
R. VIJAYARAGHAVAN ◽  
L.C. GUPTA
Keyword(s):  
Flux Line ◽  
Parent Material ◽  
High Tc Superconductors ◽  
S Wave ◽  
Important Ingredient ◽  
Magnetic Systems ◽  
High Tc ◽  
Antiferromagnetic Ordering ◽  
Magnetic Transport ◽  
Very High

High-Tc superconductors, distorted-perovskite cuprates, are derived, by means of suitable doping, from a Mott-insulating and antiferromagnetic parent material. The most important ingredient of their structure is the stacks of Cu-O planes which carry superconductivity. Magnetic, transport and other properties that characterize the supercon-ducting state are very unusual and highly anisotropic. Density of states at the Fermi level in these materials is rather small but Tc is very high (highest reported Tc~125 K). In the high-Tc systems that contain magnetic moment bearing rate earth (RE)-atoms, antiferromagnetic ordering (TN<2 K) of RE-moments coexists with superconductivity. Some of them are ideal two-dimensional magnetic systems. Flux line lattices in these materials have rather unusual structural properties. There are both hole-type as well as electron-type superconductors. The available experimental evidence does not favour odd-parity pairing. It is not yet clear, however, whether even-parity pairing is d-wave or s-wave type. Antiferromagnetic fluctuations may be possible mechanism of Cooper pairing. Anyonic superconductivity is ruled out.

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