Abstract
The influence of the defect structure on the superconducting properties of high temperature superconductors has been studied experimentally and by computer simulation technique. The relation between defect structure and the superconducting transition temperature, T{sub c}, has been studied in Co-doped YBCO (YBa{sub 2}Cu{sub 3-y}Co{sub y}O{sub 6+x}, 0 {<=} y {<=} 0.5), and it has been shown that th model, which has been established to account for the influence of oxygen ordering on T{sub c} in oxygen deficient YBCO (YBa{sub 2}Cu{sub 3}O{sub 6+x}, x < 1), is valid also for Co-doped YBCO. A three-dimensional model for the oxygen ordering in undoped YBCO has been introduced and used to analyse experimental structural data. Good agreement between the model predictions and the experimental data has been established. Experimental studies of crystal structure, oxygen stoichiometry, and electrical and magnetic properties of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4+x} have been carried out in order to elucidate why this material apparently is an electron conductor in the superconducting phase, and not as the other high temperature superconductors, a hole conductor. Structural studies on Pb{sub 2}Sr{sub 2}Y{sub 1-x}Ca{sub x}Cu{sub 3}O{sub 8} (0 {<=} x {<=} 0.5) have been carried out by neutron powder diffraction and it has been shown
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Citation Formats
Hessel Andersen, N.
Defect structures in ceramic superconductors; Defektstrukturer i keramiske superledere.
Denmark: N. p.,
1993.
Web.
Hessel Andersen, N.
Defect structures in ceramic superconductors; Defektstrukturer i keramiske superledere.
Denmark.
Hessel Andersen, N.
1993.
"Defect structures in ceramic superconductors; Defektstrukturer i keramiske superledere."
Denmark.
@misc{etde_10152918,
title = {Defect structures in ceramic superconductors; Defektstrukturer i keramiske superledere}
author = {Hessel Andersen, N}
abstractNote = {The influence of the defect structure on the superconducting properties of high temperature superconductors has been studied experimentally and by computer simulation technique. The relation between defect structure and the superconducting transition temperature, T{sub c}, has been studied in Co-doped YBCO (YBa{sub 2}Cu{sub 3-y}Co{sub y}O{sub 6+x}, 0 {<=} y {<=} 0.5), and it has been shown that th model, which has been established to account for the influence of oxygen ordering on T{sub c} in oxygen deficient YBCO (YBa{sub 2}Cu{sub 3}O{sub 6+x}, x < 1), is valid also for Co-doped YBCO. A three-dimensional model for the oxygen ordering in undoped YBCO has been introduced and used to analyse experimental structural data. Good agreement between the model predictions and the experimental data has been established. Experimental studies of crystal structure, oxygen stoichiometry, and electrical and magnetic properties of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4+x} have been carried out in order to elucidate why this material apparently is an electron conductor in the superconducting phase, and not as the other high temperature superconductors, a hole conductor. Structural studies on Pb{sub 2}Sr{sub 2}Y{sub 1-x}Ca{sub x}Cu{sub 3}O{sub 8} (0 {<=} x {<=} 0.5) have been carried out by neutron powder diffraction and it has been shown how the Ca-stoichiometry influence the Cu-valence in the superconducting CuO{sub 2}-planes. The structural ordering of epitaxial thin films of YBCO and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} deposit on heated substrates of SrTiO{sub 3}, MgO, LaAlO{sub 3} and NdGaO{sub 3} has been studied by x-ray diffraction and Rutherford Backscattering spectroscopy, and the structural ordering has been analysed in relation to the superconducting properties. (au) (9 ills., 10 refs.).}
place = {Denmark}
year = {1993}
month = {Dec}
}
title = {Defect structures in ceramic superconductors; Defektstrukturer i keramiske superledere}
author = {Hessel Andersen, N}
abstractNote = {The influence of the defect structure on the superconducting properties of high temperature superconductors has been studied experimentally and by computer simulation technique. The relation between defect structure and the superconducting transition temperature, T{sub c}, has been studied in Co-doped YBCO (YBa{sub 2}Cu{sub 3-y}Co{sub y}O{sub 6+x}, 0 {<=} y {<=} 0.5), and it has been shown that th model, which has been established to account for the influence of oxygen ordering on T{sub c} in oxygen deficient YBCO (YBa{sub 2}Cu{sub 3}O{sub 6+x}, x < 1), is valid also for Co-doped YBCO. A three-dimensional model for the oxygen ordering in undoped YBCO has been introduced and used to analyse experimental structural data. Good agreement between the model predictions and the experimental data has been established. Experimental studies of crystal structure, oxygen stoichiometry, and electrical and magnetic properties of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4+x} have been carried out in order to elucidate why this material apparently is an electron conductor in the superconducting phase, and not as the other high temperature superconductors, a hole conductor. Structural studies on Pb{sub 2}Sr{sub 2}Y{sub 1-x}Ca{sub x}Cu{sub 3}O{sub 8} (0 {<=} x {<=} 0.5) have been carried out by neutron powder diffraction and it has been shown how the Ca-stoichiometry influence the Cu-valence in the superconducting CuO{sub 2}-planes. The structural ordering of epitaxial thin films of YBCO and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} deposit on heated substrates of SrTiO{sub 3}, MgO, LaAlO{sub 3} and NdGaO{sub 3} has been studied by x-ray diffraction and Rutherford Backscattering spectroscopy, and the structural ordering has been analysed in relation to the superconducting properties. (au) (9 ills., 10 refs.).}
place = {Denmark}
year = {1993}
month = {Dec}
}