Penetration depth anisotropy due to the proximity effect in a d-density-wave scenario -: art. no. 012504

We calculate the penetration depth lambda along the a and b directions in the presence of the pseudogap and superconducting phases for a simple model that incorporates two layers-a CuO2 plane and a CuO chain per unit cell. The CuO chains become superconducting due to the proximity to the planes below the critical temperature. The pseudogap phase has been considered to be a result of the d-density-wave (DDW) phase. The temperature dependence of lambda(a) is always different from lambda(b) as it depends on the induced gap in the chains. The DDW phase plays a vital role not only to distinguish the temperature dependence of lambda(b) from that of lambda(a) but also to identify the mixed phase from the pure phase of these superconductors.