Srn-1Cun+1O2n: From One Dimension to Two Dimensions via Trellis Lattices
The key elements in all known cuprate superconductors are lightly doped Cu02-planes. Recently a new homologous series of compounds Sr n−1Cu n+1O2n have been reported in which the planes contain a parallel array of line defects which form a trellis lattice with ladder-segments of the square lattice weakly coupled through triangular line defects. The magnetic properties of undoped compounds will be dominated by the properties of the ladders. Heisenberg s = 1/2 ladders can have a spin liquid groundstate with a spin gap if the number of rungs is odd so that a short range RVB groundstate is predicted for such trellis lattices. Using a t- J model to describe the doped material leads to the prediction of a d- wave RVB superconducting groundstate with a large spin gap.
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