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

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2011-12-16

arxiv.org/abs/1112.3894v1

Physics

Condensed Matter

Materials Science

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Scientific paper

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.

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