Interlayer tunneling spectroscopy for slightly overdoped Bi2Sr2CaCu2O8+δ

Minoru Suzuki, Takao Watanabe, Azusa Matsuda

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Abstract

We have measured the interlayer tunneling characteristics of slightly overdoped Bi2Si2CaCu2O8+δ in the c-axis direction from 10 to 220 K by using very thin mesas containing approximately ten CuO2 double layers. The superconducting gap 2Δ is 50 meV at 10 K and shows a temperature (T) dependence similar to that of the BCS theory. A pseudogap evolves below 150 K, where the c-axis resistivity ρc is semiconducting. The normal-state tunneling resistance RN shows a linear T dependence down to Tc, exhibits an abrupt decrease at Tc, and saturates at low T. This reflects scattering arising from an electronic interaction that is relevant to the high-Tc superconductivity.

Original languageEnglish
Pages (from-to)5361-5364
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number26 I
Publication statusPublished - 1999 Jun 28
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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