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Nonbolometric Infrared Detection in La 2-x Sr x CuO 4 and YBa 2 Cu 3 O y Epitaxial Thin Films

1990; Institute of Physics; Volume: 29; Issue: 3A Linguagem: Inglês

10.1143/jjap.29.l466

1347-4065

K. Tanabe, Youichi Enomoto, Minoru Suzuki, Tsunekazu Iwata, Akihiko Yamaji,

Semiconductor Quantum Structures and Devices

The electrical responses to infrared radiation of La 2- x Sr x CuO 4 (100) and YBa 2 Cu 3 O y (110) epitaxial thin films with relatively low T c values and J c values of 10 4 –10 5 A/cm 2 are studied using modulated laser light. These films show apparent nonbolometric responses at temperatures below the transition regions which are strongly dependent on the bias current. The difference in the observed responsivity between these high- T c materials and BaPb 1- x Bi x O 3 can be explained on the basis of nonequilibrium superconductivity.