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KCuCl$_3$ is a three-dimensional coupled spin-dimer system and has a singletground state with an excitation gap ${\Delta}/k_{\rm B}=31$ K. High-fieldmagnetization measurements for KCuCl$_3$ have been performed in static magneticfields of up to 30 T and in pulsed magnetic fields of up to 60 T. The entiremagnetization curve including the saturation region was obtained at $T=1.3$ K.  From the analysis of the magnetization curve, it was found that the exchangeparameters determined from the dispersion relations of the magnetic excitationsshould be reduced, which suggests the importance of the renormalization effectin the magnetic excitations. The field-induced magnetic ordering accompanied bythe cusplike minimum of the magnetization was observed as in the isomorphouscompound TlCuCl$_3$. The phase boundary was almost independent of the fielddirection, and is represented by the power law. These results are consistentwith the magnon Bose-Einstein condensation picture for field-induced magneticordering.Comment: 9 pages, 7 figures, 9 eps files, revtex styl

physical review. b, condensed matter

Field-induced magnetic ordering in the quantum spin system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">KCuCl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Field-induced magnetic ordering in the quantum spin systemKCuCl3