Intrinsic tunneling spectra of Bi2(Sr2-xLax)CuO6+δ -: art. no. 147005

We have measured intrinsic-tunneling spectra of a single CuO-layer La-doped Bi-2(Sr2-xLax)CuO6+delta (Bi2201-La-x). Despite a difference of a factor of 3 in the optimal superconducting critical temperatures for Bi2201-La-0.4 and Bi2212 (32 and 95 K, respectively) and different spectral energy scales, we find that the pseudogap vanishes at a similar characteristic temperature T* approximate to 230-300 K for both compounds. We find also that, in Bi2201-La-x, pseudogap humps are seen as sharp peaks and, in fact, even dominate the intrinsic spectra.