Title :
Connection of residual losses of a microwave energy in superconductive state of YBa2Cu3O7-δ films on sapphire substrates with their resistance in a normal state
Author :
Poustylnik, O.D.
Author_Institution :
Res. Center Fonon, Kiev, Ukraine
Abstract :
The results of research of temperature dependence of surface resistance RS(T) of epitaxial films of YBa2Cu3O7-δ deposited onto sapphire substrates are presented. The measurements were made at a frequency of 135 GHz. It is shown that the obtained results in a low temperature range can be satisfactory explained by means of the existing theoretical model of losses in high-temperature superconductor films connected with a presence of normal domains like spherical inclusions.
Keywords :
barium compounds; high-frequency effects; high-temperature superconductors; inclusions; losses; superconducting epitaxial layers; surface conductivity; yttrium compounds; 135 GHz; Al2O3; YBa2Cu3O7-δ films; YBa2Cu3O7; epitaxial films; high-temperature superconductor films; low temperature; microwave energy; normal domains; normal state; residual losses; sapphire substrates; spherical inclusions; superconductive state; surface resistance; temperature dependence; Conductive films; Conductivity; Dielectrics; High temperature superconductors; Permittivity; Substrates; Superconducting films; Superconductivity; Surface impedance; Surface resistance;
Conference_Titel :
Physics and Engineering of Millimeter and Submillimeter Waves, 1998. MSMW '98. Third International Kharkov Symposium
Print_ISBN :
0-7803-5553-9
DOI :
10.1109/MSMW.1998.758972
