Superfluid and normal fluid density in high-Tc superconductors

D. B. Tanner, H. L. Liu, M. A. Quijada, A. M. Zibold, H. Berger, R. J. Kelley, M. Onellion, F. C. Chou, D. C. Johnston, J. P. Rice, D. M. Ginsberg, J. T. Markert

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


The electronic properties of the cuprate superconductors have been studied by measuring the reflectance over the frequency range from the far-infrared to the near-ultraviolet (roughly, 10 meV-5 eV). There is an interesting behavior in both the normal state and the superconducting state. In the normal state, there is the well-known non-Drude distribution of the doping-induced spectral weight. In the superconducting state, the spectral weight of the superconducting condensate correlates with Tc in a variety of materials. Remarkably, in optimally doped superconductors, only about 20% of the doping-induced carriers joins the superfluid; the rest of the spectral weight remains at finite frequencies.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalPhysica B: Condensed Matter
Publication statusPublished - 1998 Jan 1


  • Far-infrared spectroscopy
  • High-temperature superconductors
  • Optical properties
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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