Title :
Superconducting YBCO films on polycrystalline yttrium-iron-garnet using IBAD-YSZ as a template
Author :
Jia, Q.X. ; Arendt, P.N. ; Foltyn, S.R. ; Holesinger, T.G. ; DePaula, AndR F.
Author_Institution :
Supercond. Technol. Center, Los Alamos Nat. Lab., NM, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
Monolithic integration of high quality YBCO films on polycrystalline yttrium-iron-garnet (YIG) substrates represents an advance of great technical significance for magnetically tunable microwave components. We have solved the problems of crystallographic incompatibility between the two materials and the lack of an epitaxial template for the growth of well-oriented YBCO films. Using a buffer layer of biaxially oriented yttria-stabilized zirconia (YSZ), deposited by an ion-beam-assisted-deposition (IBAD) technique, we routinely produced device quality YBCO films on polycrystalline YIG substrates. The YBCO films were c-axis oriented with an in-plane mosaic spread of less than 7° FWHM. The films had transition temperatures above 88 K, transition widths less than 0.3 K, and critical current densities above 106 A/cm2 in self-field at 75 K. The surface resistance of the films was ~0.86 mΩ at 10 GHz and 76 K
Keywords :
barium compounds; critical current density (superconductivity); garnets; high-frequency effects; high-temperature superconductors; ion beam assisted deposition; superconducting thin films; superconducting transition temperature; surface conductivity; yttrium compounds; zirconium compounds; 0.86 mohm; 10 GHz; 75 K; 76 K; 88 K; FWHM; IBAD-YSZ template; YBa2Cu3O7-Y2O3ZrO2-YFe5O12; YBa2Cu3O7-Y2O3 (ZrO2)-YIG; YIG; biaxially oriented yttria-stabilized zirconia; buffer layer; c-axis oriented; critical current densities; crystallographic incompatibility; epitaxial template; high quality YBCO films; in-plane mosaic spread; ion-beam-assisted-deposition; magnetically tunable microwave components; monolithic integration; polycrystalline yttrium-iron-garnet; self-field; superconducting YBCO films; surface resistance; transition temperatures; transition width; Magnetic films; Monolithic integrated circuits; Substrates; Superconducting epitaxial layers; Superconducting films; Superconducting magnets; Superconducting microwave devices; Superconducting transition temperature; Surface resistance; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
