2001/07/26 by Y. Xuan, Xuan, Y., H. J. Tao +11
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0107540
4 pages, 5 figures, 1 table
arxiv created 2001/07/26 · arxiv updated 2009/11/30
Temperature and doping dependent tunneling spectroscopy on Bi2Sr2CaCu2O8+δ 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, Δp-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 Δp-p below Tc can be naturally treated as the vector sum of two competing orders: a BCS-like superconducting gap and a residual pseudogap.