Quasiparticle dynamics and superconductivity in the 60-K phase of YBa2Cu3Oy

초록

We report several key findings to elucidate the 60-K phase of the high-T-c superconductors YBa2CU3Oy by using infrared spectroscopy on the y = 6.65 and 6.75 compounds. In contrast to no significant change of T., the coherent spectral weight and the superfluid density increase gradually with y, which indicates an increase of the doping amount in the CuO2 plane with increasing y. The resistivity merging observed in the normal state is attributed to an unusual enhancement of the scattering rate with doping.

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