Intrinsic tunneling spectra of Bi2(Sr(2-x)Lax)CuO(6+delta).
We have measured intrinsic-tunneling spectra of a single CuO-layer La-doped Bi2(Sr(2-x)Lax)CuO(6+delta) (Bi2201-Lax). Despite a difference of a factor of 3 in the optimal superconducting critical temperatures for Bi2201-La0.4 and Bi2212 (32 and 95 K, respectively) and different spectral energy scales, we find that the pseudogap vanishes at a similar characteristic temperature T* approximately 230-300 K for both compounds. We find also that, in Bi2201-Lax, pseudogap humps are seen as sharp peaks and, in fact, even dominate the intrinsic spectra.
Chalmers University of Technology, S-41296 Göteborg, Sweden.
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A
Yurgens
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D
Winkler
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T
Claeson
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Ono
Yoichi
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Ando