Spin conductivity in the XXZ chain is proportional to 1/T at high T, diverging when one-quasiparticle magnetization is infinite due to 1/N-scaled long-range correlations.
Classification of the string solutions of Bethe equations in an XXZ model of arbitrary spin
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Long-range correlation and the spin conductivity in the XXZ chain from ballistic macroscopic fluctuation theory
Spin conductivity in the XXZ chain is proportional to 1/T at high T, diverging when one-quasiparticle magnetization is infinite due to 1/N-scaled long-range correlations.