Resonances in a dilute gas of magnons and metamagnetism of isotropic frustrated ferromagnetic spin chains

Details Resonances in a dilute gas of magnons and metamagnetism of isotropic frustrated ferromagnetic spin chains Resonances in a dilute gas of magnons and metamagnetism of isotropic frustrated ferromagnetic spin chains

2011-05-27

arxiv.org/abs/1105.5626v2

Phys. Rev. B 84, 224409 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages RevTex4, 9 eps figures: Extended version, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.84.224409

We show that spin-S chains with SU(2)-symmetric, ferromagnetic nearest-neighbor and frustrating antiferromagnetic next-nearest-neighbor exchange interactions exhibit metamagnetic behavior under the influence of an external magnetic field for small S, in the form of a first-order transition to the fully polarized state. The corresponding magnetization jump increases gradually starting from an S-dependent critical value of exchange couplings and takes a maximum in the vicinity of a ferromagnetic Lifshitz point. The metamagnetism results from resonances in the dilute magnon gas caused by an interplay between quantum fluctuations and frustration.

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