S.R. Herd, P. Chaudhari
Journal of Applied Physics
We have made measurements of the T dependence of microwave absorption (at 22.7 GHz) in films of Y1Ba2Cu3Ox on SrTiO3 and LaGaO3 substrates. The superconducting transition temperatures were near 90 K. The film on SrTiO3 had predominantly c axis normal to the film, while the film on LaGaO3 was partially a axis oriented. The microwave losses L for both films followed the temperature dependence given by L∝t/square root of 1-t, with t=T/T c. In the macroscopic theory of Ginzburg-Landau, this expression is proportional to the number of normal electrons within a penetration depth of the surface of the film, provided (1-t)≪1. However, we find that the above expression fits the data well for a wide range of T.
S.R. Herd, P. Chaudhari
Journal of Applied Physics
S.R. Herd, P. Chaudhari
physica status solidi (a)
M. Däumling, E. Sarnelli, et al.
Applied Physics Letters
K.N. Tu, P. Chaudhari, et al.
Journal of Applied Physics