Josephson plasma frequencies in overdoped Bi2Sr2CaCu2O8+δ

H. Shibata, Azusa Matsuda

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Abstract

Far-infrared sphere resonance in Bi2Sr2CaCu2O8+δ samples with various oxygen concentrations is measured down to 5 cm-1. Although no peaks are observed in this frequency range for the optimumly doped sample, the Josephson plasma peak is observed at 5 cm-1 for a 1-atm-O2-annealed sample. The peak shifts to higher frequencies as the doping increases, and is observed at 11 cm-1 for a 150-atm-O2-annealed sample. The c-axis penetration depth λc obtained from the peak frequencies is determined to be 77 to 35 μm. These large λc values are larger than the value estimated from the Josephson-coupled layer model, while the doping dependence is qualitatively explained by the model.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number18
Publication statusPublished - 1999 May 1
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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