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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 26
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Phys. Rev. Lett. 82, 5361–5364 (1999)

Interlayer Tunneling Spectroscopy for Slightly Overdoped Bi2Sr2CaCu2O8+δ

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Minoru Suzuki1,*, Takao Watanabe2, and Azusa Matsuda2
1NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 162 Tokai, Ibaraki 319-1193, Japan
2NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 31 Morinosato, Wakamiya, Atsugi, Kanagawa 243-0198, Japan

Received 4 February 1999; published in the issue dated 28 June 1999

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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.5361
DOI:
10.1103/PhysRevLett.82.5361
PACS:
74.50.+r, 74.25.Jb, 74.72.Hs

*Present address: Department of Electronic Science and Engineering, Kyoto University, Kyoto 606-8501, Japan.

 
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