Intrinsic Tunneling Spectra of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ near Optimal Doping

S. P. Zhao, X. B. Zhu, Y. F. Wei

We report tunneling spectra of near optimally doped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ intrinsic Josephson junctions with area of 0.09 $\mu$m${}^2$, which avoid some fundamental difficultie…