Macroscopic magnetization jumps due to independent magnons in frustrated quantum spin lattices

Abstract

For a class of frustrated spin lattices including the kagome lattice we construct exact eigenstates consisting of several independent, localized one-magnon states and argue that they are ground states for high magnetic fields. If the maximal number of local magnons scales with the number of spins in the system, which is the case for the kagome lattice, the effect persists in the thermodynamic limit and gives rise to a macroscopic jump in the zero-temperature magnetization curve just below the saturation field. The effect decreases with increasing spin quantum number and vanishes in the classical limit. Thus it is a true macroscopic quantum effect.

4 pages, 4 figures, accepted by Phys.Rev.Lett

References in corpus (4)

• Field induced transitions in a kagome antiferromagnet
• Magnetization Process of the S=1 and 1/2 Uniform and Distorted Kagome Heisenberg Antiferromagnets
• Independent magnon states on magnetic polytopes
• From classical to quantum Kagome antiferromagnet in a magnetic field

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