F. Onufrieva et al., SPIN DYNAMICS IN THE DOPED ANTIFERROMAGNETIC STATE OF COPPER-OXIDE SUPERCONDUCTORS, Physica. B, Condensed matter, 194, 1994, pp. 1449-1450
The evolution with doping of the magnon energy and damping as well as
the incoherent spin excitations in lightly-doped copper-oxide supercon
ductors (LDCOS) have been investigated within the extended t-J model.
The instability of the 2D-AF ground state for the doping n > n(c) almo
st-equal-to 2.7% has been obtained.