Phys. Rev. Lett. 88, 207003 (2002) [4 pages]Evidence for a Nodeless Gap from the Superfluid Density of Optimally Doped Pr1.855Ce0.145CuO4-y FilmsReceived 5 July 2001; published 7 May 2002 We present measurements of the ab-plane magnetic penetration depth, λ(T), in five optimally doped Pr1.855Ce0.145CuO4-y films for 1.6K≤T≤Tc∼24K. Low resistivities, high superfluid densities ns(T)∝λ-2(T), high Tc’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, Δmin, of 0.85kBTc. This behavior is consistent with a nodeless gap and is incompatible with d-wave superconductivity. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.207003
DOI:
10.1103/PhysRevLett.88.207003
PACS:
74.25.Fy, 74.72.Jt, 74.76.Bz
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