Abstract
Detailed photoinduced infrared absorption studies of semiconducting Y 1Ba 2Cu 3O 6+y (y<0.2) and La 2CuO 4 were carried out. We observed two broad absorptions, one at ∼ 0.13 eV and the other at ∼ 0.62 eV in the photoinduced absorption spectrum of Y 1Ba 2Cu 3O 6+y in contrast to the previous photoexcitation results. We found that the lower energy peak positions in both Y 1Ba 2Cu 3O 6+y and La 2CuO 4 abruptly change at T - T c of the corresponding superconducting phase. The amount of energy shift seems to be related to the pairing energy. Carrier recombination dynamics studies suggest that the ground state of photocarriers in the CuO 2 plane at T < T c is remarkably different from that observed a T > T c.
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