c-Axis infrared properties of Sm2-cursive greek chi Cecursive greek chiCuO4-δ

Jae Hoon Kim, O. Beom-Hoan, J. T. Markert, D. Van Der Marel

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Abstract

We have measured the grazing-incidence p-polarized far-infrared reflectivity of Sm2-cursive Greek chiCecursive Greek chiCuO4-δ crystals (Tc = 15 K). C-axis longitudinal-optical phonon features are clearly visible at 430, 570, and 600 cm-1. The phonon frequencies do not shift with temperature, which indicates that the electronic component of the dielectric function remains almost unaltered above the energy scale of 3-4kBTc across the superconducting transition. Below Tc the absorptivity (measured down to 30 cm-1) does not show a signature of a threshold at around 3.5kBTc characteristic of BCS superconductivity. Based on our observations with E(combining right arrow above) ∥ c(combining right arrow above) an upper limit of 30 cm-1 can be placed on the energy of the screened Josephson plasmon for temperatures down to 4 K.

Original languageEnglish
Pages (from-to)1023-1024
Number of pages2
JournalPhysica C: Superconductivity and its applications
Volume282-287
Issue numberPART 2
Publication statusPublished - 1997 Aug 1

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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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