Physics – Condensed Matter – Superconductivity
Scientific paper
2001-07-26
Physics
Condensed Matter
Superconductivity
4 pages, 5 figures, 1 table
Scientific paper
Temperature and doping dependent tunneling spectroscopy on $Bi_2Sr_2CaCu_2O_{8+\delta}$ single crystals has been investigated by using break-junction technique. The results provide direct evidence that the pseudogap persists into heavily overdoped regime, possibly in whole doping range of the superconducting phase. The gap value determined from the peak-to-peak of the conductance, $\Delta_{p-p}$, exhibits a jump-like increase as $T$ is raised across the critical temperature. The magnitude of the jump, the pseudogap opening temperature and superconducting gap decrease with raising doping. The $\Delta_{p-p}$ below $T_c$ can be naturally treated as the vector sum of two competing orders: a BCS-like superconducting gap and a residual pseudogap.
Li Zaidong
Lin Tai-Chia
Ni Mei Yan
Tao H. J.
Xuan Yi
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