Strong damping of the c-axis plasmon in high-Tc cuprate superconductors

Jae H. Kim, H. S. Somal, M. T. Czyzyk, D. van der Marel, A. Wittlin, A. M. Gerrits, V. H.M. Duijn, N. T. Hien, A. A. Menovsky

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Abstract

We analyze the infrared reflectivity of La1.85Sr0.15CuO4 single crystals with E parallel to the c-axis. The plasma edge at around 6 meV (50 cm-1), which occurs only for T < Tc, is due to Cooper-pair tunneling. This low value of the plasma edge is shown to be consistent with the c-axis plasma frequency obtained from LDA band structure calculations (> 0.1 eV) if we take into account that the single-particle charge transport along the c-axis is strongly incoherent in the normal state, and remains so in the superconducting state. From a comparison of the optical conductivity with model calculations based on s- and d-wave weak-coupling theory in the dirty limit, we find no evidence for a reduction of the c-axis quasi-particle scattering rate below Tc. The c-axis scattering rate, the normal-state c-axis plasma frequency, and Tc obey hγ > hνp ≫ 3.5κBTc, which is exactly opposite to the clean limit.

Original languageEnglish
Pages (from-to)297-308
Number of pages12
JournalPhysica C: Superconductivity and its applications
Volume247
Issue number3-4
DOIs
Publication statusPublished - 1995 Jun 1

All Science Journal Classification (ASJC) codes

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

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    Kim, J. H., Somal, H. S., Czyzyk, M. T., van der Marel, D., Wittlin, A., Gerrits, A. M., Duijn, V. H. M., Hien, N. T., & Menovsky, A. A. (1995). Strong damping of the c-axis plasmon in high-Tc cuprate superconductors. Physica C: Superconductivity and its applications, 247(3-4), 297-308. https://doi.org/10.1016/0921-4534(95)00198-0