2003/01/13 by John A. Skint, Skint, John A., Mun-Seog Kim +7
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0301174
6 pages, 4 figures
arxiv created 2003/01/13 · arxiv updated 2009/11/30
From measurements of the magnetic penetration depth, λ(T), from 1.6 K to Tc in films of electron-doped cuprates La2-xCexCuO4-y and Pr2-xCexCuO4-y we obtain the normalized density of states, Ns(E) at T=0 by using a simple model. In this framework, the flat behavior of λ-2(T) at low T implies Ns(E) is small, possibly gapped, at low energies. The upward curvature in λ-2(T) near Tc seen in overdoped films implies that superfluid comes from an anomalously small energy band within about 3kBTc of the Fermi surface.