Probing the Fermi level of Y1-xPrxBa2Cu3O7-δ by femtosecond spectroscopy

A. S. Kazeroonian, T. K. Cheng, S. D. Brorson, Qi Li, E. P. Ippen, X. D. Wu, T. Venkatesan, S. Etemad, M. S. Dresselhaus, G. Dresselhaus

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Femtosecond spectroscopy at room temperature indicates a monotonic rise in the Fermi level EF vs. Pr concentration x in Y1-xPrxBa2Cu3O7-δ. For x=0.12±0.02, the Fermi level lies 2.0 eV below the unoccupied Cu d bands. The decrease in Tc with increasing x is consistent with a band filling model. The room temperature decay time τ of the transient reflectivity ΔR increases from τ<60 fs in superconducting YBa2Cu3O7-δ to τ=140 fs in non-superconducting PrBa2Cu3O7-δ. The effects of Pr substitution for Y on the position of the Fermi level are qualitatively similar to the effects of de-oxygenation on the EF of YBa2Cu3O7-δ.

Original languageEnglish (US)
Pages (from-to)95-98
Number of pages4
JournalSolid State Communications
Issue number2
StatePublished - Jan 1 1991

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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