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For a class of frustrated spin lattices including the kagome lattice weconstruct exact eigenstates consisting of several independent, localizedone-magnon states and argue that they are ground states for high magneticfields. If the maximal number of local magnons scales with the number of spinsin the system, which is the case for the kagome lattice, the effect persists inthe thermodynamic limit and gives rise to a macroscopic jump in thezero-temperature magnetization curve just below the saturation field. Theeffect decreases with increasing spin quantum number and vanishes in theclassical limit. Thus it is a true macroscopic quantum effect.Comment: 4 pages, 4 figures, accepted by Phys.Rev.Let

Macroscopic Magnetization Jumps due to Independent Magnons in Frustrated Quantum Spin Lattices