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Unlike most quantum systems which rapidly become incoherent as temperature israised, strong correlations persist at elevated temperatures in $S=1/2$ dimermagnets, as revealed by the unusual asymmetric lineshape of their excitationsat finite temperatures. Here we quantitatively explore and parameterize thestrongly correlated magnetic excitations at finite temperatures using the highresolution inelastic neutron scattering on the model compoundBaCu$_2$V$_2$O$_8$ which we show to be an alternatingantiferromagnetic-ferromagnetic spin$-1/2$ chain. Comparison to state of theart computational techniques shows excellent agreement over a wide temperaturerange. Our findings hence demonstrate the possibility to quantitatively predictcoherent behavior at elevated temperatures in quantum magnets.

Magnetic excitations in the S = 1/2 antiferromagnetic-ferromagnetic chain compound BaCu2V2O8 at zero and finite temperature