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Inelastic and elastic neutron scattering is used to study spin correlationsin the quasi-one dimensional quantum antiferromagnet IPA-CuCl3 in strongapplied magnetic fields. A condensation of magnons and commensurate transverselong-range ordering is observe at a critical filed $H_c=9.5$ T. The fielddependencies of the energies and polarizations of all magnon branches areinvestigated both below and above the transition point. Their dispersion ismeasured across the entire 1D Brillouin zone in magnetic fields up to 14 T. Thecritical wave vector of magnon spectrum truncation [Masuda et al., Phys. Rev.Lett. 96, 047210 (2006)] is found to shift from h_c 0.35 at H>H_c. A drasticreduction of magnon bandwidths in the ordered phase [Garlea et al., Phys. Rev.Lett. 98, 167202 (2007)] is observed and studied in detail. New features of thespectrum, presumably related to this bandwidth collapse, are observed justabove the transition field.

Dynamics of quantum spin liquid and spin solid phases in IPA-CuCl3 under field