A model of CuO2 planes weakly doped with partially delocalised holes is considered. The effect of such a hole on the background AFM spin texture can be represented by a purely magnetic Hamiltonian H=−∑(ijk)(Si⋅Sj×Sk)2, where the summation is over the four triangles of a single plaquette. We show that this model of randomly distributed chiral spin defects leads to an in--plane spin correlation length approximately described by ξ−1(x,T)=ξ−1(0,T)+ξ−1(x,0), consistent with neutron scattering experiments on La2−xSrxCuO4. Further, this model leads to favourable comparisons with B1g Raman scattering results for the same cuprate system.
@article{arxiv.cond-mat/9209007,
title = {Spin texture in weakly doped $Cu0_2$ planes explaining magnetic correlation length and Raman scattering experiments},
author = {R. J. Gooding and A. Mailhot},
journal= {arXiv preprint arXiv:cond-mat/9209007},
year = {2007}
}