2003/03/24 by P. Süle, Süle, P.
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0303502
13 pages, 7 figures
arxiv created 2003/03/24 · arxiv updated 2009/11/30
We analyze the superconducting state and c-axis charge dynamics of cuprates at optimal doping using a charge ordered bilayer superlattice model in which pairing is supported by inter-layer Coulomb energy gain (potential energy driven superconductivity).The 2D pair-condensate can be characterized by a charge ordered state with a "checkerboard" like pattern seen by scanning tunneling microscopy.The pair condensation might lead to the sharp decrease of the normal state c-axis anisotropy of the hole content and hence to the decrease of inter-layer dielectric screening.The decrease of the c-axis dielectric screening can be the primary source of the condensation energy below Tc. We find that a net gain in the electrostatic energy occurs along the c-axis, which is proportional to the measured condensation energy (U0) and with Tc:Ec3D ≈ 2 (ξab/a0+1)2 U0 ≈ kB Tc and is due to inter-layer charge complementarity (charge asymmetry of the boson condensate) where ξab is the coherence length of the condensate and a0 ≈ 3.9 Å is the in-planelattice constant.