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We have performed high-field magnetization and ESR measurements onBa$_3$CoSb$_2$O$_9$ single crystals, as a representative two-dimensionalspin-1/2 Heisenberg antiferromagnet on a uniform triangular lattice, and havedetermined all the magnetic parameters. For an applied magnetic field $H$parallel to the $ab$-plane, the entire magnetization curve including theplateau at one-third of the saturation magnetization ($M_\mathrm{s}$) is inexcellent agreement with the results of theoretical calculations except ananomaly near $(3/5)M_\mathrm{s}$, indicative of an additional field-inducedtransition. However, for $H\,{\parallel}\,c$, the magnetization curve exhibitsa cusp near $M_\mathrm{s}/3$. Paramagnetic resonance signals above the N\'eeltemperature indicate the nearly isotropic $g$-factor. A detailed analysis ofthe collective ESR modes observed in the ordered state, combined with themagnetization process, provides evidence of the weak easy-plane anisotropy.

Magnetization Process and Collective Excitations in the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9