Infrared Signature of the Superconducting State in Pr(2-x)Ce(x)CuO(4)

Details Infrared Signature of the Superconducting State in Pr(2-x)Ce(x)CuO(4) Infrared Signature of the Superconducting State in Pr(2-x)Ce(x)CuO(4)

2004-05-13

arxiv.org/abs/cond-mat/0405284v1

Phys. Rev. B 70, 132502 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.132502

We measured the far infrared reflectivity of two superconducting Pr(2-x)Ce(x)CuO(4) films above and below Tc. 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 2 Delta_{max} / kB Tc ~ 4.7. We determined absolute values of the penetration depth at 5 K as lambda_{ab} = (3300 +/- 700) A for x = 0.15 and lambda_{ab} = (2000 +/- 300) A for x = 0.17. A spectral weight analysis shows that the Ferrell-Glover-Tinkham sum rule is satisfied at conventional low energy scales \~ 4 Delta_{max}.

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