Title :
Surface impedance of Tl-2212 thin films at THz-frequencies
Author :
Khazan, Max ; Wilke, Ingrid ; Stevens, Christopher
Author_Institution :
Inst. fur Angewandte Phys., Hamburg Univ., Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
We report on first measurements of the surface resistance and the London penetration depth of Tl2Ba2CaCu2O8 thin films in the frequency range from 200 GHz to 1.0 THz at temperatures from 25 to 268 K carried out by time-domain Terahertz transmission spectroscopy. We observe in the superconducting state an increase of the surface resistance with the square of the frequency up to 0.9 THz at 77 K and above, At 78 K and 0.9 THz the surface resistance is 1.6 Ω. Below 77 K the surface resistance increases with the cube of the frequency. Finally, the surface resistance of Tl2Ba2CaCu2O8 is compared to that of YBa2Cu3O6.95 and gold
Keywords :
barium compounds; calcium compounds; high-frequency effects; high-temperature superconductors; penetration depth (superconductivity); superconducting thin films; surface conductivity; thallium compounds; 200 GHz to 1 THz; 25 to 268 K; Au; London penetration depth; THz-frequencies; Tl-2212 thin films; Tl2Ba2CaCu2O8; Tl2Ba2CaCu2O8 thin films; YBa2Cu3O6.95; gold; superconducting state; surface impedance; surface resistance; time-domain Terahertz transmission spectroscopy; Electrical resistance measurement; Frequency measurement; Spectroscopy; Submillimeter wave measurements; Superconducting thin films; Surface impedance; Surface resistance; Temperature distribution; Time domain analysis; Transistors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
