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.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry