## Abstract

We measured the far infrared reflectivity of two superconducting Pr _{2-x}Ce_{x}CuCO_{4} 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 T_{c} as 2Δ_{max}/k_{B}T _{c}≈4.7. We determined absolute values of the penetration depth at 5 K as λ_{ab}=(3300±700) Å for x=0.15 and λ_{ab}=(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 -4Δ_{max}.

Original language | English |
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Article number | 132502 |

Pages (from-to) | 132502-1-132502-4 |

Journal | Physical Review B - Condensed Matter and Materials Physics |

Volume | 70 |

Issue number | 13 |

DOIs | |

State | Published - Oct 2004 |

Externally published | Yes |

### Funding

Funders | Funder number |
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National Science Foundation | |

Directorate for Mathematical and Physical Sciences | 0102350 |

Directorate for Mathematical and Physical Sciences |

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