Correlation of thermally stimulated luminescence with radio frequency surface resistance of high‐temperature superconductors

1989 ◽  
Vol 55 (10) ◽  
pp. 1038-1040 ◽  
Author(s):  
D. W. Cooke ◽  
B. Bennett ◽  
E. R. Gray ◽  
R. J. Houlton ◽  
W. L. Hults ◽  
...  
Keyword(s):  
High Temperature ◽  
Radio Frequency ◽  
Surface Resistance ◽  
High Temperature Superconductors ◽  
Thermally Stimulated Luminescence

Surface resistance of thin Perovskite films — high-temperature superconductors and giant magnetoresistance manganites

1996 ◽  
Vol 288 (1-2) ◽  
pp. 256-261 ◽  
Author(s):  
S.E. Lofland ◽  
M. Dominguez ◽  
S.D. Tyagi ◽  
S.M. Bhagat ◽  
M.C. Robson ◽  
...  
Keyword(s):  
High Temperature ◽  
Giant Magnetoresistance ◽  
Surface Resistance ◽  
High Temperature Superconductors

Thermally stimulated luminescence from commonly occuring impurity phases in high-temperature superconductors

1990 ◽  
Vol 47 (3) ◽  
pp. 85-91 ◽  
Author(s):  
M.S. Jahan ◽  
D.W. Cooke ◽  
W.L. Hults ◽  
J.L. Smith ◽  
B.L. Bennett ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Thermally Stimulated Luminescence ◽  
Impurity Phases

Luminescence from Defects and Impurity Centers in Y2O3

1989 ◽  
Vol 169 ◽  
Author(s):  
M. S. Jahan ◽  
D. W. Cooke ◽  
B. L Bennett ◽  
W. L Hults ◽  
M. A. Maez ◽  
...  
Keyword(s):  
High Temperature ◽  
Surface Resistance ◽  
High Temperature Superconductors ◽  
Emission Spectra ◽  
Second Phase ◽  
X Rays ◽  
Deep Traps ◽  
Impurity Ions ◽  
Order Of Magnitude ◽  
Impurity Centers

AbstractHigh-purity (99.999%) Y2O3 powder is used as a starting material for fabricating high-temperature superconductors (HTS), and is frequently found as an unreacted second phase in the final product. We have found that as-received Y2O3 contains Tb3+ paramagnetic impurity ions as determined by TSL and emission-spectra measurements. Deep luminescence traps (presumably Tb4+ ions) are formed in Y2O3 when it is exposed to frays, x rays, or fluorescent lights. These deep traps can only be removed by annealing the material to near 1600°C. Given the short coherence length of HTS it is possible that order-of-magnitude variations in the Tb impurity concentration of starting materials may affect the ultimate value of surface resistance (Rs).

THE SURFACE IMPEDANCE OF HIGH Tc SUPERCONDUCTORS

1989 ◽  
Vol 03 (01) ◽  
pp. 5-13 ◽  
Author(s):  
J. CARINI ◽  
L. DRABECK ◽  
G. GRÜNER
Keyword(s):  
High Temperature ◽  
Temperature Dependence ◽  
Power Law ◽  
Surface Impedance ◽  
Low Temperatures ◽  
Qualitative Agreement ◽  
Surface Resistance ◽  
High Temperature Superconductors ◽  
High Tc Superconductors ◽  
High Tc

Recent experiments on the surface impedance of the high temperature superconductors are summarized. The overall temperature dependence of the penetration depth is in broad qualitative agreement with conventional pairing, but with an anomolous power law behavior observed at low temperatures. The surface resistance is orders of magnitude larger than estimates based on the Mattis-Bardeen theory. One possibility is unconventional pairing, but structural inhomogenities are the most likely explanation for the experimental results.

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