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Science 14 July 2000:
Vol. 289. no. 5477, pp. 277 - 281
DOI: 10.1126/science.289.5477.277
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Reports
Signature of Superfluid Density in the Single-Particle Excitation Spectrum of Bi2Sr2CaCu2O8+
D. L. Feng,1*
D. H. Lu,1
K. M. Shen,1
C. Kim,1
H. Eisaki,1
A. Damascelli,1
R. Yoshizaki,2
J.-i. Shimoyama,3
K. Kishio,3
G. D. Gu,4
S. Oh,5
A. Andrus,5
J. O'Donnell,5
J. N. Eckstein,5
Z.-X. Shen1*
We report that the doping and temperature dependence of
photoemission spectra near the Brillouin zone boundary of
Bi2Sr2CaCu2O8+
exhibit unexpected sensitivity to the superfluid density. In the
superconducting state, the photoemission peak intensity as a function
of doping scales with the superfluid density and the condensation
energy. As a function of temperature, the peak intensity shows an
abrupt behavior near the superconducting phase transition temperature where phase coherence sets in, rather than near the temperature where
the gap opens. This anomalous manifestation of collective effects in
single-particle spectroscopy raises important questions concerning the
mechanism of high-temperature superconductivity.
1 Department of Physics, Applied Physics, and
Stanford Synchrotron Radiation Laboratory, Stanford University,
Stanford, CA 94305, USA.
2 Institute of Applied
Physics, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
3 Department of Applied Chemistry, University of
Tokyo, Tokyo 113-8656, Japan.
4 School of Physics,
University of New South Wales, Post Office Box 1, Kensington, NSW 2033, Australia.
5 Department of Physics, University of
Illinois, Urbana, IL 61801, USA.
*
To whom correspondence should be addressed: E-mail:
dlfeng{at}stanford.edu; zxshen{at}stanford.edu
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+delta.
- J. E. Hoffman, K. McElroy, D.-H. Lee, K. M Lang, H. Eisaki, S. Uchida, and J. C. Davis (2002)
Science
297, 1148-1151
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- Superconductivity-Induced Transfer of In-Plane Spectral Weight in Bi2Sr2CaCu2O8+delta.
- H. J. A. Molegraaf, C. Presura, D. van der Marel, P. H. Kes, and M. Li (2002)
Science
295, 2239-2241
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