Fj. Owens, AC MAGNETIC-FIELD-INDUCED MICROWAVE-ABSORPTION IN HIGH-TEMPERATURE SUPERCONDUCTOR TL2BA2CA2CU3OX, Solid state communications, 91(11), 1994, pp. 919-922
The application of an a.c. magnetic field from 8 to 40 G peak to peak
amplitude in the frequency range from 25 to 100 KHz to Tl2Ba2Ca2Cu3Ox
below T-c causes a substantial increase in the absorption of microwave
energy at 9.2 GHz measured as the difference in absorption between th
e a.c. held on and off. The absorption intensity decreases as the temp
erature approaches T-c from below and increases with frequency and the
amplitude of the magnetic held. A small increasing d.c. magnetic held
gradually reduces the a.c. magnetic held induced microwave absorption
. These results are shown to be consistent with an absorption mechanis
m arising from a.c. held induced flux jumps through current loops form
ed by weak links.