Unusual Strong-Coupling Effects in the Tunneling Spectroscopy of Optimally Doped and Overdoped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{ital {delta} }}
- Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Department of Applied Physics, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162 (Japan)
- Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
- Naval Research Laboratory, Washington, D.C. 20375 (United States)
Tunneling spectroscopy measurements are reported on single crystals of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} using vacuum tunneling and point-contact methods. A reproducible dip feature in the tunneling conductance is found near {vert_bar}eV{vert_bar}=2{Delta}, observed for {ital both} voltage polarities in the best resolved spectra. With overdoping the position of the dip continues to scale with {Delta}, and its magnitude decreases as {Delta} decreases. These results indicate that the dip feature arises from a strong-coupling effect whereby the quasiparticle lifetime is decreased at a characteristic energy of {approximately}2{Delta}, consistent with an electron-electron pairing interaction. {copyright} {ital 1997} {ital The American Physical Society}
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 573834
- Journal Information:
- Physical Review Letters, Vol. 80, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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