Microscopic model calculations for the magnetization process of layered triangular-lattice quantum antiferromagnets

Daisuke Yamamoto, Giacomo Marmorini, Ippei Danshita

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Magnetization processes of spin-1/2 layered triangular-lattice antiferromagnets (TLAFs) under a magnetic field H are studied by means of a numerical cluster mean-field method with a scaling scheme. We find that small antiferromagnetic couplings between the layers give rise to several types of extra quantum phase transitions among different high-field coplanar phases. Especially, a field-induced first-order transition is found to occur at H≈0.7Hs, where Hs is the saturation field, as another common quantum effect of ideal TLAFs in addition to the well-established one-third plateau. Our microscopic model calculation with appropriate parameters shows excellent agreement with experiments on Ba3CoSb2O9 [T. Susuki et al., Phys. Rev. Lett. 110, 267201 (2013)]. Given this fact, we suggest that the Co2+-based compounds may allow for quantum simulations of intriguing properties of this simple frustrated model, such as quantum criticality and supersolid states.

Original languageEnglish
Article number027201
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 2015 Jan 16
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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