Title :
Microwave surface resistance of YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films on polycrystalline alumina and Ni-based alloy substrates with ion-beam-assisted-deposited buffer layers
Author :
Findikoglu, A.T. ; Arendt, P.N. ; Groves, J.R. ; Foltyn, S.R. ; Peterson, E.J. ; Reagor, D.W. ; Jia, Q.X.
Author_Institution :
Div. of Mater. Sci. & Technol., Los Alamos Nat. Lab., NM, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We measured the microwave surface resistance R/sub s/ of superconducting YBa/sub 2/Cu/sub 3/O/sub 7-x/(YBCO) films on buffered polycrystalline alumina and Ni-based alloy substrates using parallel-plate technique. We observed a strong between the low-power R/sub s/ and the in-plane mosaic spread of the YBCO films. A 0.4-/spl mu/m-thick YBCO film with an in-plane mosaic spread of 6.60 (7/spl deg/) on a buffered polycrystalline alloy (buffered polycrystalline alumina) showed an R/sub s/ of 0.51 m/spl Omega/ (1.89 m/spl Omega/) at 76 K and 0.17 m/spl Omega/ (0.21 m/spl Omega/) at 4 K.
Keywords :
barium compounds; high-frequency effects; high-temperature superconductors; superconducting thin films; surface conductivity; yttrium compounds; 0.4 mum; 4 K; 76 K; Ni-based alloy substrates; YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// films; YBa/sub 2/Cu/sub 3/O/sub 7/; alumina substrates; ion-beam-assisted-deposited buffer layers; microwave surface resistance; mosaic spread; parallel-plate technique; Copper alloys; Electrical resistance measurement; Microwave measurements; Microwave theory and techniques; Substrates; Superconducting films; Superconducting materials; Superconducting microwave devices; Surface resistance; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
