S. Nashima et al., Two components in femtosecond optical response of Y0.7Pr0.3Ba2Cu3O7-delta thin films in superconducting state, JPN J A P 2, 39(7A), 2000, pp. L663-L666
We studied the optical response of Y0.7Pr0.3Ba2Cu3O7-delta (YPBCO) thin fil
ms by means of a femtosecond time-resolved pump-probe method, and found tha
t its response quite differs significantly from that of YBa2Cu3O7-delta (YB
CO) thin films. It is revealed that there are two components in the transie
nt reflectivity change Delta R(t)/R of the YPBCO thin film in the supercond
ucting state. The temperature dependence of Delta R(t)/R suggests that the
one component originates from the photoexcitation of superconducting layers
and the other originates from that of normal layers. The origin of these t
wo components is discussed in relation to the electronic structure of YPBCO
.