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Magnetization processes of spin-1/2 Heisenberg ladders are studied usingstrong-coupling expansions, numerical diagonalization of finite systems and abosonization approach. We find that the magnetization exhibits plateaux as afunction of the applied field at certain rational fractions of the saturationvalue. Our main focus are ladders with 3 legs where plateaux with magnetizationone third of the saturation value are shown to exist.Comment: 5 pages REVTeX, 4 PostScript figures included using psfig.sty; this  is the final version to appear in Phys. Rev. Let

physical review letters

Magnetization Curves of Antiferromagnetic Heisenberg Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>Ladders

Magnetization Curves of Antiferromagnetic Heisenberg Spin-12Ladders