Spin-wave condensation and quantum melting of long-range antiferromagnetic order in t-J model
Abstract
Ground state wave function of two-dimensional t-J model is found at doping close to half filling. It is shown that the condensation of Cooper pairs (superconducting pairing of mobile holes) and the condensation of spin-waves into spin-liquid state are closely connected. The effective spectrum of S=1 excitations, spin-wave gap pseudo-gap M, magnetic correlation length M, and static magnetic formfactor SM( q) are calculated.
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