Signature of superfluid density in the single-particle excitation spectrum of Bi2Sr2CaCu2O(8+δ)

D. L. Feng, D. H. Lu, K. M. Shen, C. Kim, H. Eisaki, A. Damascelli, R. Yoshizaki, J. I. Shimoyama, K. Kishio, G. D. Gu, S. Oh, A. Andrus, J. O'Donnell, J. N. Eckstein, Z. X. Shen

Research output: Contribution to journalArticlepeer-review

228 Scopus citations


We report that the doping and temperature dependence of photoemission spectra near the Brillouin zone boundary of Bi2Sr2CaCu2O(8+δ) 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.

Original languageEnglish (US)
Pages (from-to)277-281
Number of pages5
Issue number5477
StatePublished - Jul 14 2000

All Science Journal Classification (ASJC) codes

  • General

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