Theory of incommensurate magnetic correlations across the insulator-superconductor transition of underdoped La2-xSrxCuO4.
The main feature in the elastic neutron scattering of La2-xSrxCuO4 is the existence of incommensurate peaks with positions that jump from 45 degrees to 0 degrees at 5% doping. We show that the spiral state of the t-t(')-t('')-J model with realistic parameters describes these data perfectly. We explain why in the insulator the peak is at 45 degrees while it switches to 0 degrees precisely at the insulator-metal transition. The calculated positions of the peaks are in agreement with the data in both phases.
Sushkov
Oleg P
OP
School of Physics, University of New South Wales, Sydney 2052, Australia. sushkov@phys.unsw.edu.au
Kotov
Valeri N
VN