Multilayer cuprate superconductors as possible systems described by   resonating-valence-bond and antiferromagnetic orders
  Coexistence of antiferromagnetism and d-wave superconductivity within a CuO_2 plane was recently observed in a wide doping region for multilayer high-temperature cuprate superconductors. We find that the experimental phase diagram is well reproduced in the slave-boson mean-field scheme of the two-dimensional t-J model by including antiferromagnetic order. We argue that weak three dimensionality coming from a multilayer structure is sufficient to stabilize antiferromagnetic order and its coexistence with superconductivity. 
Hiroyuki Yamase, Masanao Yoneya, and Kazuhiro Kuboki
cond-mat.supr-con cond-mat.str-el