S. Shikii et al., Observation of supercurrent distribution in YBa2Cu3O7-delta thin films using THz radiation excited with femtosecond laser pulses, APPL PHYS L, 74(9), 1999, pp. 1317-1319
We have demonstrated that the supercurrent distribution in current-biased Y
Ba2Cu3O7-delta thin films can be obtained by measuring the radiation power
of THz electromagnetic pulses excited with femtosecond laser pulses. As the
radiation power is proportional to the square of the bias current density
at the laser spot position, the two-dimensional current distribution can be
obtained from the intensity distribution of THz radiation by scanning the
laser spot. The characteristic supercurrent distribution is analyzed by usi
ng the critical-state model. (C) 1999 American Institute of Physics. [S0003
-6951(99)04609-4].