Scaling of the magnetic response in doped antiferromagnets.
A theory of the anomalous omega/T scaling of the dynamic magnetic response in cuprates at low doping is presented. It is based on the memory function representation of the dynamical spin susceptibility in a doped antiferromagnet where the damping of the collective mode is constant and large, whereas the equal-time spin correlations saturate at low T. Exact diagonalization results within the t-J model are shown to support assumptions. Consequences, for both the scaling function and the normalization amplitude, are well in agreement with neutron scattering results.
Prelovsek
P
P
J. Stefan Institute, SI-1000 Ljubljana, Slovenia.
Sega
I
I
Bonca
J
J