Superfluid response in electron-doped cuprate superconductors

We propose a weakly coupled two-band model with d(x)(2)-y(2) pairing symmetry to account for the anomalous temperature dependence of superfluid density rho(s) in electron-doped cuprate superconductors. This model gives a unified explanation to the presence of an upward curvature in rho(s) near T-c and a weak temperature dependence of rho(s) in low temperatures. Our work resolves a discrepancy in the interpretation of different experimental measurements and suggests that the pairing in electron-doped cuprates has predominately d(x)(2)-y(2) symmetry in the whole doping range.