Dual nature of the electronic structure of (La2-x-yNdySrx)CuO4 and La1.85Sr0.15CuO4

High resolution angle-resolved photoemission measurements have been carried out on (La1.4-x-Nd0.6Srx)CuO4, a model system with static one-dimensional (1D) charge ordering (stripe), and (La-1.85-Sr-0.15)CuO4, a high temperatur e superconductor(T-c = 40 K) with possible dynamic stripes. In addition to the straight segments near (pi, 0) and (0, pi) antinodal regions, we have i dentified the existence of spectral weight along the [1, 1] nodal direction in the electronic structure of both systems. This observation of nodal sta te, together with the straight segments near antinodal regions, reveals the dual nature of the electronic structure of stripes due to the competition of order and disorder.