Spin texture in weakly doped $Cu0_2$ planes explaining magnetic correlation length and Raman scattering experiments

Details Spin texture in weakly doped $Cu0_2$ planes explaining magnetic correlation length and Raman scattering experiments Spin texture in weakly doped $Cu0_2$ planes explaining magnetic correlation length and Raman scattering experiments

1992-09-08

arxiv.org/abs/cond-mat/9209007v1

Physics

Condensed Matter

14 pages, 1 figure available on request from bob@rjg.phy.queensu.ca

Scientific paper

A model of $CuO_2$ 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 $H = - \sum_{(ijk)} (\vec S_i \cdot \vec S_j \times \vec S_k)^2$, 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 $\xi^{-1} (x,T) = \xi^{-1} (0,T) + \xi^{-1} (x,0)$, consistent with neutron scattering experiments on $La_{2-x}Sr_xCuO_4$. Further, this model leads to favourable comparisons with $B_{1g}$ Raman scattering results for the same cuprate system.

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