Abstract
Two types of high temperature superconductor films have been prepared by diode sputtering in a high oxygen atmosphere and subsequent in situ annealing in oxygen. Both, the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}-films, showed an excellent c-axis orientation, as verified by X-ray diffraction and Rutherford backscattering spectrum measurements. The rocking curve of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} showed a full width at half maximum value (FWHM) of 0.17 , and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} showed 0.15 . The minimum yield of the channeling measurements is lower then 2% for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}, and 9% for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. The minimum yield for the Bi-superconductor is higher because of its incommensurable structure in the BiO-plane. The magnetic properties of the films were measured with a SQUID-magnetometer. Both kinds of films have the same critical temperature of approximately 91 Kelvin. However, the zero-field-cooled suscebilities for both cases were quite different: for fields of about B = 0.1 mT the transition curve is broaden for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} in contrast to the curves of the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films. Critical current estimations done with a SQUID-magnetometer yielded for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films at 5
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Citation Formats
Osthoever, C.
Preparation and characterization of epitaxial high temperature superconductor layers; Herstellung und Charakterisierung epitaktischer Hochtemperatursupraleiter-Schichten.
Germany: N. p.,
1994.
Web.
Osthoever, C.
Preparation and characterization of epitaxial high temperature superconductor layers; Herstellung und Charakterisierung epitaktischer Hochtemperatursupraleiter-Schichten.
Germany.
Osthoever, C.
1994.
"Preparation and characterization of epitaxial high temperature superconductor layers; Herstellung und Charakterisierung epitaktischer Hochtemperatursupraleiter-Schichten."
Germany.
@misc{etde_10128411,
title = {Preparation and characterization of epitaxial high temperature superconductor layers; Herstellung und Charakterisierung epitaktischer Hochtemperatursupraleiter-Schichten}
author = {Osthoever, C}
abstractNote = {Two types of high temperature superconductor films have been prepared by diode sputtering in a high oxygen atmosphere and subsequent in situ annealing in oxygen. Both, the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}-films, showed an excellent c-axis orientation, as verified by X-ray diffraction and Rutherford backscattering spectrum measurements. The rocking curve of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} showed a full width at half maximum value (FWHM) of 0.17 , and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} showed 0.15 . The minimum yield of the channeling measurements is lower then 2% for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}, and 9% for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. The minimum yield for the Bi-superconductor is higher because of its incommensurable structure in the BiO-plane. The magnetic properties of the films were measured with a SQUID-magnetometer. Both kinds of films have the same critical temperature of approximately 91 Kelvin. However, the zero-field-cooled suscebilities for both cases were quite different: for fields of about B = 0.1 mT the transition curve is broaden for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} in contrast to the curves of the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films. Critical current estimations done with a SQUID-magnetometer yielded for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films at 5 K J{sub C}(5K) = 6.0 10{sup 7} A/cm{sup 2}, and at 77 Kelvin J{sub C}(77K) = 3.7 10{sup 6} A/cm{sup 2}, for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} at 5 K J{sub C}(5K) = 1.0 10{sup 7} A/cm{sup 2}, at 77 K J{sub C}(77K) = 1.0 10{sup 4} A/cm{sup 2}. The different behaviour of both samples in an external magnetic field can be explained by a strong different anisotropy of the superconducting properties. (orig.)}
place = {Germany}
year = {1994}
month = {Aug}
}
title = {Preparation and characterization of epitaxial high temperature superconductor layers; Herstellung und Charakterisierung epitaktischer Hochtemperatursupraleiter-Schichten}
author = {Osthoever, C}
abstractNote = {Two types of high temperature superconductor films have been prepared by diode sputtering in a high oxygen atmosphere and subsequent in situ annealing in oxygen. Both, the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}-films, showed an excellent c-axis orientation, as verified by X-ray diffraction and Rutherford backscattering spectrum measurements. The rocking curve of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} showed a full width at half maximum value (FWHM) of 0.17 , and Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} showed 0.15 . The minimum yield of the channeling measurements is lower then 2% for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}, and 9% for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. The minimum yield for the Bi-superconductor is higher because of its incommensurable structure in the BiO-plane. The magnetic properties of the films were measured with a SQUID-magnetometer. Both kinds of films have the same critical temperature of approximately 91 Kelvin. However, the zero-field-cooled suscebilities for both cases were quite different: for fields of about B = 0.1 mT the transition curve is broaden for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} in contrast to the curves of the YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films. Critical current estimations done with a SQUID-magnetometer yielded for YBa{sub 2}Cu{sub 3}O{sub 7-{delta}}-films at 5 K J{sub C}(5K) = 6.0 10{sup 7} A/cm{sup 2}, and at 77 Kelvin J{sub C}(77K) = 3.7 10{sup 6} A/cm{sup 2}, for Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} at 5 K J{sub C}(5K) = 1.0 10{sup 7} A/cm{sup 2}, at 77 K J{sub C}(77K) = 1.0 10{sup 4} A/cm{sup 2}. The different behaviour of both samples in an external magnetic field can be explained by a strong different anisotropy of the superconducting properties. (orig.)}
place = {Germany}
year = {1994}
month = {Aug}
}