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Nature of low-energy excitations in La1.87Sr0.13CuO4 superconducting cuprate

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Abstract

The spectra of the conductivity and dielectric constant of La1.87Sr0.13CuO4 cuprate have been directly measured in the frequency range of 0.3 to 1.2 THz (10–40 cm−1) and the temperature range of 5 to 300 K in the E | c polarization (the electric field vector of radiation is perpendicular to the copper-oxygen planes). Excitation has been observed in the superconducting phase, and its nature has been attributed to the transverse optical excitation of the condensate of Cooper pairs, which appears because Josephson junctions between CuO planes are modulated due to in-plane magnetic and charge stripes. Additional quasiparticle absorption of unknown origin has been detected at frequencies below ≈15 cm−1 at liquid helium temperatures.

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia

    A. A. Voronkov, B. P. Gorshunov, V. S. Nozdrin & E. S. Zhukova

  2. Moscow Institute of Physics and Technology (State University), Institutskii per. 9, Dolgoprudnyi, Moscow region, 141700, Russia

    A. A. Voronkov, B. P. Gorshunov & E. S. Zhukova

  3. Department of Physics, Osaka University, 560-0043, Osaka, Japan

    T. Matsuoka, K. Tanaka, S. Miyasaka & S. Tajima

  4. 1. Physikalisches Institut, Universitát Stuttgart, 70550, Stuttgart, Germany

    M. Dressel

Authors
  1. A. A. Voronkov
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  2. B. P. Gorshunov
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  3. V. S. Nozdrin
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  4. E. S. Zhukova
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  5. T. Matsuoka
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  6. K. Tanaka
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  7. S. Miyasaka
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  8. S. Tajima
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  9. M. Dressel
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Corresponding author

Correspondence to B. P. Gorshunov.

Additional information

Original Russian Text © A.A. Voronkov, B.P. Gorshunov, V.S. Nozdrin, E.S. Zhukova, T. Matsuoka, K. Tanaka, S. Miyasaka, S. Tajima, M. Dressel, 2011, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2011, Vol. 94, No. 9, pp. 767–773.

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Voronkov, A.A., Gorshunov, B.P., Nozdrin, V.S. et al. Nature of low-energy excitations in La1.87Sr0.13CuO4 superconducting cuprate. Jetp Lett. 94, 708–713 (2012). https://doi.org/10.1134/S0021364011210120

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  • DOI: https://doi.org/10.1134/S0021364011210120

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