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

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

2001-08-29

arxiv.org/abs/cond-mat/0108498v2

Phys. Rev. Lett. 88, 167207 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.88.167207

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.

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