Title :
Microwave resonances with partially untwinned YBCO films near 10 GHz
Author :
Vogt, A. ; Herwig, R. ; Marienhoff, P. ; Neuhaus, M. ; Scherer, T. ; Jutzi, W.
Author_Institution :
Karlsruhe Univ., Germany
fDate :
3/1/1993 12:00:00 AM
Abstract :
Partially untwinned YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) films on twin-free NdGaO/sub 3/-substrates have been fabricated by off-axis sputtering. The ratio of the a- and b-axis DC resistances is on the same order as untwinned crystals. The film DC resistances values differ by less than a factor of two from those of untwinned crystals. The surface resistance in the a- and b-direction near 10 GHz has been measured with only one parallel plate resonator of rectangular area. The anisotropy ratio of the surface resistance at 4.2 K is on the order of 1.9. The b-axis surface resistance at 10 GHz and 4.2 K is about 25 mu Omega .<>
Keywords :
barium compounds; high-temperature superconductors; sputter deposition; superconducting thin films; surface conductivity; yttrium compounds; 10 GHz; 25 muohm; 4.2 K; DC resistances; NdGaO/sub 3/ substrate; YBCO films; YBa/sub 2/Cu/sub 3/O/sub 7-x/ partially untwinned films; anisotropy ratio; microwave resonances; off-axis sputtering; parallel plate resonator; surface resistance; Anisotropic magnetoresistance; Crystals; Electrical resistance measurement; Magnetic films; Resonance; Substrates; Surface resistance; Temperature; Transistors; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
