Evidence for a Nodeless Gap from the Superfluid Density of Optimally Doped Pr_1.855Ce_0.145CuO_4-y Films

2001/07/31 by John A. Skinta, Thomas R. Lemberger, Tine Greibe +2 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.88.207003

published as Physical Review Letters 88, 207003 (2002) · 5 pages, 4 figures, reorganized for clarity

arxiv created 2002/05/07 · openalex publication_date 2002/05/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present measurements of the ab-plane magnetic penetration depth, λ(T), in five optimally doped Pr_1.855Ce_0.145CuO_4-y films for 1.6 K ≤ T ≤ T_c ∼ 24 K. Low resistivities, high superfluid densities n_s(T)∝ λ^-2(T), high T_c's, and small transition widths are reproducible and indicative of excellent film quality. For all five films, λ^-2(T)/λ^-2(0) at low T is well fitted by an exponential temperature dependence with a gap, Δ_min, of 0.85 k_B T_c. This behavior is consistent with a nodeless gap and is incompatible with d-wave superconductivity.

Citations

• Nonlocal Effects on the Magnetic Penetration Depth ind-Wave Superconductors

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