Title :
Microwave surface resistance of nickel and zinc doped YBCO single crystals in the a-b plane
Author :
Kuan Zhang ; Bonn, D.A. ; Ruixing Liang ; Hardy, W.N.
Author_Institution :
Dept. of Phys., British Columbia Univ., Vancouver, BC, Canada
fDate :
6/1/1995 12:00:00 AM
Abstract :
The microwave surface resistance of crystals of YBa/sub 2/(Cu/sub 1-x/M/sub x/)/sub 3/O/sub 7-/spl delta//, with M being Ni or Zn, has been systematically studied at 34.8 GHz. Both Zn (x=0.0015 and 0.0031) and Ni (x=0.0075 and 0.0140) impurities were found to be capable of lowering the surface resistance, and also substantially altering its temperature dependence. The results suggest that the microwave loss of high temperature superconducting thin films might be improved by slightly doping the material with impurities.<>
Keywords :
barium compounds; high-frequency effects; high-temperature superconductors; nickel; surface conductivity; yttrium compounds; zinc; 34.8 GHz; YBa/sub 2/Cu/sub 3/O/sub 7/:Ni; YBa/sub 2/Cu/sub 3/O/sub 7/:Zn; a-b plane; doped YBCO single crystals; high temperature superconducting thin films; microwave loss; microwave surface resistance; superconducting state surface resistance; temperature dependence; Crystals; Doping; Impurities; Nickel; Superconducting materials; Superconducting thin films; Surface resistance; Temperature dependence; Yttrium barium copper oxide; Zinc;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
