Superconducting energy gap versus pseudogap in hole-doped cuprates as revealed by infrared spectroscopy

T. Dong, F. Zhou, N. L. Wang

We present in-plane infrared reflectance measurement on two superconducting cuprates with relatively low T${}_c$: a nearly optimally-doped Bi${}_2$Sr${}_{1.6}$La${}_{0.4}$CuO${}_{6+\delta }$ with…