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Cu-0 Superconductors: Through a Lens, but Darkly

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Novel Superconductivity

Abstract

The shock of superconducting transition temperatures (Tc’s) greater than 25 K in Cu-O based compounds1 has loosed a tidal wave of research. We have involved ourselves in a study of the optical properties of these materials, with particular emphasis on La2-xSrxCuO4 compounds. Recently we reported 2 reflectivity, R, spectra of La2-xSrxCuO4 for x = 0 and 0.175, and of Ba2YCu3O9-δ (δ~2.1) over a broad range of photon energy. The most striking observation was the profound deviation from the expected Drude-like R in the metallic compounds. Fitting R required that ∈ (ω) be dominated by a transition at energy 0.45 eV in La1.825Sr175CuO4 and 0.65 eV in Ba2YCu3O9-δ. From our fit we determined that the integrated oscillator strength in the 0.45 eV feature in La1.825Sr0.175CuO4 corresponded to a value of Neff m/m* of 2.5xl021cm-3. This density agrees well with the density of positive carriers (assuming one hole per Sr atom) of 1.9x 1021cm-3. Similar conclusions for La1.825Sr0.175CuO4 were reached by Herr et al.3 based upon Kramers-Kronig (KK) analysis of their R data.

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Author information

Authors and Affiliations

  1. AT&T Bell Laboratories, Murray Hill, NJ, 07974, USA

    Joseph Orenstein, G. A. Thomas, D. H. Rapkine, C. G. Bethea, B. F. Levine, R. J. Cava, A. S. Cooper, D. W. Johnson Jr., J. P. Remeika & E. A. Rietman

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  1. Joseph Orenstein
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  2. G. A. Thomas
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  3. D. H. Rapkine
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  4. C. G. Bethea
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  5. B. F. Levine
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  6. R. J. Cava
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  7. A. S. Cooper
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  8. D. W. Johnson Jr.
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  9. J. P. Remeika
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  10. E. A. Rietman
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Editor information

Editors and Affiliations

  1. Naval Research Laboratory, Washington, D.C., USA

    Stuart A. Wolf

  2. Lawrence Berkeley Laboratory, University of California, Berkeley, Berkeley, California, USA

    Vladimir Z. Kresin

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© 1987 Plenum Press, New York

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Orenstein, J. et al. (1987). Cu-0 Superconductors: Through a Lens, but Darkly. In: Wolf, S.A., Kresin, V.Z. (eds) Novel Superconductivity. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-1937-5_79

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  • DOI: https://doi.org/10.1007/978-1-4613-1937-5_79

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-9076-6

  • Online ISBN: 978-1-4613-1937-5

  • eBook Packages: Springer Book Archive

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