Spin correlations in the paramagnetic phase and ring exchange in lanthanum cuprate

Abstract

Spin correlations in the paramagnetic phase of lanthanum cuprate 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 non-linear sigma model. Secondly, 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.

4 pages, 3 figures

References in corpus (4)

• Spin waves and electronic interactions in La2CuO4
• Effects of biquadratic exchange on the spectrum of elementary excitations in spin ladders
• Instantaneous Spin Correlations in La2CuO4
• Does the Heisenberg model describe the multimagnon spin dynamics in antiferromagnetic CuO layers ?

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