Comment on "Unconventional Magnetism in a Nitrogen-Containing Analog of Cupric Oxide"

Alexander A. Tsirlin; Helge Rosner

Comment on "Unconventional Magnetism in a Nitrogen-Containing Analog of Cupric Oxide"

Materials Science 2011-12-19 v1 Strongly Correlated Electrons

Authors: Alexander A. Tsirlin , Helge Rosner

Abstract

In a recent Letter [PRL, 107, 047208 (2011)], Zorko et al. report on an "unexpected inhomogeneous magnetism" related to "a peculiar fragility" of the resonating-valence-bond (RVB) electronic state in the spin-1/2 quantum magnet CuNCN. Here, we show that: i) the spin model of the anisotropic triangular lattice (ATL), as proposed by Zorko et al., does not apply to CuNCN; ii) this model does not support the proclaimed RVB ground state in the relevant parameter range; iii) the magnetic state of CuNCN is not necessarily inhomogeneous.

Keywords

resonating-valence-bond quantum magnet anisotropic triangular lattice inhomogeneous magnetism ground state

Cite

@article{arxiv.1112.3894,
  title  = {Comment on "Unconventional Magnetism in a Nitrogen-Containing Analog of Cupric Oxide"},
  author = {Alexander A. Tsirlin and Helge Rosner},
  journal= {arXiv preprint arXiv:1112.3894},
  year   = {2011}
}

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