High Tc ceramic superconductors: Introduction, background, and challenges to the electron microscopist

1988 ◽  
Vol 8 (3) ◽  
pp. 247-250 ◽  
Author(s):  
Peter K. Davies
Keyword(s):  
High Tc ◽  
Ceramic Superconductors ◽  
Electron Microscopist

The Nature of Flux Pinning in High TC Ceramic Superconductors / Die Wirkungsweise der Flußschlauch-Haftung in Keramik-Hochtemperatur-Supraleitern

1988 ◽  
Vol 79 (5) ◽  
pp. 271-277
Author(s):  
Chalakara V. Narasimha Rao ◽  
Shyam K. Agarwal ◽  
Betanabhatla Jayaram ◽  
Sylvester Takacs ◽  
Anant V. Narlikar
Keyword(s):  
Flux Pinning ◽  
High Tc ◽  
Ceramic Superconductors

A STRUCTURAL CHEMICAL MODEL FOR HIGH Tc CERAMIC SUPERCONDUCTORS

1987 ◽  
Vol 01 (07n08) ◽  
pp. 275-288 ◽  
Author(s):  
S.R. OVSHINSKY ◽  
S.J. HUDGENS ◽  
R.L. LINTVEDT ◽  
D.B. RORABACHER
Keyword(s):  
Electronic Properties ◽  
Oxygen Vacancies ◽  
Oxygen Removal ◽  
Bose Condensation ◽  
Oxidation States ◽  
Chemical Model ◽  
Electrically Conductive ◽  
High Tc ◽  
Ceramic Superconductors ◽  
Mixed Oxidation

A structual chemical model for high Tc ceramic superconductors is proposed in which carriers pairs, coupled through a superexchange process, undergo Bose condensation. In the Y-Ba-Cu-O system, Cu atoms on “chain” sites and “sheet” sites are initially assigned formal oxidation states of +3 and +2, respectively, and “sheet”/“chain” interactions are then introduced to bring about the electrically conductive mixed oxidation state. This model explains the presence of labile oxygen in the “chain” structures, describes the structure of deoxygenated phases exhibiting ordered oxygen vacancies in the “chains”, and allows interpretation of the effects of oxygen removal on magnetic and electronic properties of the material.

High-Tc Ceramic Superconductors Through Oxidation of Mechanically Alloyed Y-Ba-Cu and Bi-Sr-Ca-Cu Powders

1989 ◽  
pp. 281-286
Author(s):  
Shin-ichi Murasaki ◽  
Satoru Taniguchi ◽  
Uichiro Mizutani ◽  
Motohiro Suganuma ◽  
Yuh Yamada
Keyword(s):  
Mechanically Alloyed ◽  
High Tc ◽  
Ceramic Superconductors

Internal friction in high Tc iron doped 1-2-3 yttrium ceramic superconductors

1990 ◽  
Vol 74 (7) ◽  
pp. 595-598 ◽  
Author(s):  
B. Kusz ◽  
R. Barczynski ◽  
M. Gazda ◽  
L. Murawski ◽  
O. Gzowski ◽  
...  
Keyword(s):  
Internal Friction ◽  
High Tc ◽  
Ceramic Superconductors ◽  
Iron Doped

Point contact measurements on high Tc ceramic superconductors

1988 ◽  
Vol 37 (1) ◽  
pp. 138-140 ◽  
Author(s):  
Niels Hessel Andersen ◽  
Ib Johannsen ◽  
Mogens T Levinsen
Keyword(s):  
Point Contact ◽  
High Tc ◽  
Ceramic Superconductors ◽  
Contact Measurements

QUANTUM NETWORK SIMULATIONS OF HIGH Tc CERAMIC SUPERCONDUCTORS

1988 ◽  
Vol 02 (06) ◽  
pp. 1399-1405 ◽  
Author(s):  
MARK JEFFERY ◽  
CHARLES GREEN ◽  
SOMDEV TYAGI ◽  
R. GILMORE
Keyword(s):  
Quantum Network ◽  
High Tc ◽  
One Dimensional ◽  
Ceramic Superconductors ◽  
Weak Magnetic Fields ◽  
Weakly Coupled ◽  
S Matrix ◽  
Network Simulations ◽  
Quantum Network Model ◽  
Absorption Measurements

Microwave absorption measurements of the high T c ceramic superconductors reveal reproducible features in weak magnetic fields. These features are qualitatively explained by a quantum network model of these superconducting oxides. The ceramic superconductors are modeled as a set of one-dimensional wires weakly coupled at random nodes. The magnetoconductance, magnetization and susceptibility are computed from the network S-matrix.

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