Low Temperature Correlation Lengths of Bilayer Heisenberg AntiFerromagnets and Neutron Scattering
Lan Yin, Sudip Chakravarty
Abstract
The low temperature correlation length and the static structure factor are computed for bilayer antiferromagnets such as YBa2Cu3O6. It is shown that energy integrated two-axis scan in neutron scattering experiments can be meaningfully interpreted to extract correlation length in such bilayer antiferromagnets despite intensity modulation in the momentum perpendicular to the layers. Thus, precise measurements of the spin-spin correlation length can be performed in the future, and the theoretical predictions can be tested. It is also shown how the same correlation length can be measured in nuclear magnetic resonance experiments.
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