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Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures

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Abstract

We study the energy spectrum of Bi2223 (Bi1.6Pb0.4Sr1.8Ca2.2Cu3Ox) at high hydrostatic pressures by Andreev-and tunneling-spectroscopy methods. We determine the gap anisotropy in the basal ab plane and find the following values for the parameters Δ(ϕ): Δmax=42 mV, and Δmin=19.5 mV (T c =110 K and dT c /dP=0.16 K/kbar). We detect an increase in the ratio R=2Δmax/kT c with pressure P; for Bi2223 cuprate, dR/dP≈0.017 kbar−1. In the phonon-frequency region we detect a “softening,” due to pressure, of the high-frequency part of the phonon spectrum corresponding to “breathing” modes of oxygen, as well as other optical modes of Cu-O. The characteristic frequencies of the spectrum for ℏΩ>60 mV are found to decrease, with increasing pressure, at a rate d ln(ℏΩ)/dP≈−6.5±0.5×10−3 kbar−1. This result explains the observed increase in the ratio 2Δ/kT c (P) in the model of strong electron-phonon interaction.

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Authors and Affiliations

  1. A. A. Galkin Donetsk Physicotechnical Institute, Ukrainian National Academy of Sciences, 340114, Donetsk, Ukraine

    V. M. Svistunov, V. Yu. Tarenkov & A. I. D’yachenko

  2. College of Industrial Technology, Amagasaki Nishi-Koya, Japan

    R. Aoku

  3. Osaka University, Japan

    H. Murakami & M. Shirai

Authors
  1. V. M. Svistunov
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  2. V. Yu. Tarenkov
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  3. A. I. D’yachenko
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  4. R. Aoku
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  5. H. Murakami
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  6. M. Shirai
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Additional information

Zh. Éksp. Teor. Fiz. 113, 1397–1410 (April 1998)

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Svistunov, V.M., Tarenkov, V.Y., D’yachenko, A.I. et al. Spectroscopy of quasiparticle excitations of superconducting bismuth cuprate at high pressures. J. Exp. Theor. Phys. 86, 763–770 (1998). https://doi.org/10.1134/1.558537

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  • DOI: https://doi.org/10.1134/1.558537

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