Infrared signature of the superconducting state in Pr2-xCe xCuO4

A. Zimmers*, R. P.S.M. Lobo, N. Bontemps, C. C. Homes, M. C. Barr, Y. Dagan, R. L. Greene

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We measured the far infrared reflectivity of two superconducting Pr 2-xCexCuCO4 films above and below T c. The reflectivity in the superconducting state increases and the optical conductivity drops at low energies, in agreement with the opening of a (possibly) anisotropic superconducting gap. The maximum energy of the gap scales roughly with Tc as 2Δmax/kBT c≈4.7. We determined absolute values of the penetration depth at 5 K as λab=(3300±700) Å for x=0.15 and λab=(2000±300) Å for x=0.17. A spectral weight analysis shows that the Ferrell-Glover-Tinkham sum rule is satisfied at conventional low energy scales -4Δmax.

Original languageEnglish
Article number132502
Pages (from-to)132502-1-132502-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
StatePublished - Oct 2004
Externally publishedYes


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