Antiferromagnetism in kagome $\alpha$-Cu$_{3}$Mg(OH)$_6$Br$_2$

Yuan Wei; Zili Feng; Clarina dela Cruz; Wei Yi; Zi Yang Meng; Jia-Wei Mei; Youguo Shi; Shiliang Li

doi:10.1103/PhysRevB.100.155129

Antiferromagnetism in kagome $\alpha$-Cu$_{3}$Mg(OH)$_6$Br$_2$

Strongly Correlated Electrons 2019-10-23 v1

Authors: Yuan Wei , Zili Feng , Clarina dela Cruz , Wei Yi , Zi Yang Meng , Jia-Wei Mei , Youguo Shi , Shiliang Li

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Abstract

The antiferromagnetism in $\alpha$ -Cu $_3$ Mg(OH) $_6$ Br $_2$ was studied by magnetic-susceptibility, specific-heat and neutron-diffraction measurements. The crystal structure consists of Cu $^{2+}$ kagome layers with Mg $^{2+}$ ions occupying the centers of the hexagons, separated by Br $^{1-}$ ions. The magnetic system orders antiferromagnetically at 5.4 K with the magnetic moments aligned ferromagnetically within the kagome planes. The ordered moment is 0.94 $\mu_B$ , suggesting little quantum and geometrical fluctuations. By comparing the magnetic and specific-heat properties with those of the haydeeite, we suggest that $\alpha$ -Cu $_3$ Mg(OH) $_6$ Br $_2$ may be described by the two-dimensional spin- $1/2$ Heisenberg kagome model and is in the region of the ferromagnetic-order side of the phase diagram.

Keywords

antiferromagnetism kagome lattice cu3mg(oh)6br2 neutron diffraction heisenberg kagome model

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@article{arxiv.1904.13189,
  title  = {Antiferromagnetism in kagome $\alpha$-Cu$_{3}$Mg(OH)$_6$Br$_2$},
  author = {Yuan Wei and Zili Feng and Clarina dela Cruz and Wei Yi and Zi Yang Meng and Jia-Wei Mei and Youguo Shi and Shiliang Li},
  journal= {arXiv preprint arXiv:1904.13189},
  year   = {2019}
}

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5 pages, 4 figures

Antiferromagnetism in kagome $\alpha$-Cu$_{3}$Mg(OH)$_6$Br$_2$

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