Toader, A M , Goff, J P , Roger, M , Shannon, N , Stewart, J R and Enderle, M (2005) Spin correlations in the paramagnetic phase and ring exchange in La2CuO4. Physical Review Letters, 94 (19).
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Spin correlations in the paramagnetic phase of La2CuO4 have been studied using polarized neutron scattering, with two important results. First, the temperature dependence of the characteristic energy scale of the fluctuations and the amplitude of the neutron structure factor are shown to be in quantitative agreement with the predictions of the quantum nonlinear sigma model. Second, a comparison of a high-temperature series expansion of the equal-time spin correlations with the diffuse neutron intensity provides definitive experimental evidence for ring exchange.
This is a Submitted version This version's date is: 20/5/2005 This item is not peer reviewed
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