Field Dependence of Penetration Depth in an Electron-Doped Cuprate Superconductor Nd_2-xCe_xCuO₄ with x = 0.16

Abstract

We investigated the magnetic-field dependence of penetration depth in the Meissner state in an electron-doped cuprate superconductor Nd_2-xCe_xCuO₄ with x = 0.16, to clarify the symmetry of the order parameter of the superconducting state of these materials.We found that the results are consistent with a gap with lines of nodes.Thus, it is speculated that the d_x²_-y² symmetry is common to all the cuprate superconductors, both for hole-doped and electron-doped materials.