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Nuclear magnetic resonance (NMR) study of the high magnetic field (H) part ofthe Bose-Einstein condensed (BEC) phase of the quasi-onedimensional (quasi-1D)antiferromagnetic quantum spin-chain compound NiCl2-4SC(NH2)2 (DTN) wasperformed. We precisely determined the phase boundary, Tc(H), down to 40 mK;the critical boson density, n_c(Tc); and the absolute value of the BEC orderparameter S_perp at very low temperature (T = 0.12 K). All results areaccurately reproduced by numerical quantum Monte Carlo simulations of arealistic three-dimensional (3D) model Hamiltonian. Approximate analyticalpredictions based on the 1D Tomonaga-Luttinger liquid description are found tobe precise for Tc(H), but less so for S_perp(H), which is more sensitive to thestrength of 3D couplings, in particular close to the critical field. Amean-field treatment, based on the Hartree-Fock-Popov description, is found tobe valid only up to n_c = 4% (T < 0.3 K), while for higher n_c bosoninteractions appear to modify the density of states.

Nuclear magnetic resonance study of the magnetic-field-induced ordered phase in the NiCl2-4SC(NH2)2 compound