Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6

Details Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6 Intrinsic tunneling spectra of Bi_2(Sr_{2-x}La_x)CuO_6

2002-12-23

arxiv.org/abs/cond-mat/0212562v1

Physics

Condensed Matter

Superconductivity

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.147005

We have measured intrinsic-tunneling spectra of a single CuO-layer La-doped Bi_2Sr_{2-x}La_xCuO_{6+\delta} (Bi2201-La_x). Despite a difference of a factor of three 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*\approx 230-300K for both compounds. We find also that in Bi2201-La_x, PG humps are seen as sharp peaks and, in fact, even dominate the intrinsic spectra.

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