Finite-temperature scaling of spin correlations in a partially magnetized Heisenberg S=1/2 chain

Inelastic neutron scattering is employed to study transverse spin correlations of a Heisenberg S = 1/2 chain compound in a magnetic field of 7.5 T. The target compound is the antiferromagnetic Heisenberg S = 1/2 chain material 2(1,4-dioxane)center dot 2(H2O)center dot CuCl2, or CuDCl for short. The validity and the limitations of the scaling relation for the transverse dynamic structure factor are tested, discussed, and compared to the Tomonaga-Luttinger spin liquid theory and to Bethe-ansatz results for the Heisenberg model.