Infrared signature of the superconducting state in Pr2−xCexCuO4
A. Zimmers, R. P. S. M. Lobo, N. Bontemps, C. C. Homes, M. C. Barr, Y. Dagan, R. L. Greene
DOI 10.1103/PhysRevB.70.132502 · Physical Review B
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Abstract
We measured the far infrared reflectivity of two superconducting Pr2−xCexCuO4 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 2Δmax∕kBTc≈4.7. We determined absolute values of the penetration depth at 5K 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | zero_resistance |
| Pr2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | zero_resistance |
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