Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3

Yoshihiko Okamoto; Hajime Ishikawa; Gøran J. Nilsen; Zenji Hiroi

doi:10.1143/JPSJ.81.033707

Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3

Materials Science 2015-06-04 v2

Authors: Yoshihiko Okamoto , Hajime Ishikawa , Gøran J. Nilsen , Zenji Hiroi

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Abstract

We study polycrystalline samples of KCu3As2O7(OH)3, a new candidate spin-1/2 kagome antiferromagnet, by magnetic susceptibility and heat capacity measurements above 2 K. The unique arrangement of the 3z2 - r2 and x2 - y2 orbitals on the Cu2+ kagome net is noted and compared to the orbital patterns found in other kagome minerals. It is suggested that this orbital arrangement gives rise to one antiferromagnetic and two ferromagnetic interactions on isosceles triangles forming a highly distorted kagome lattice. KCu3As2O7(OH)3 is found to show an antiferromagnetic long-range order at T_N = 7.2 K. Remarkably, a spin entropy is more gradually released upon cooling below T_N compared with a conventional magnetic long-range order, which may originate from the geometrical frustration still present in this highly distorted kagome lattice.

Keywords

KCu3As2O7(OH)3 kagome antiferromagnet orbital arrangement distorted kagome lattice magnetic susceptibility heat capacity geometrical frustration Anderson localization

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@article{arxiv.1202.2913,
  title  = {Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3},
  author = {Yoshihiko Okamoto and Hajime Ishikawa and Gøran J. Nilsen and Zenji Hiroi},
  journal= {arXiv preprint arXiv:1202.2913},
  year   = {2015}
}

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5 pages, 4 figures

Distorted Kagome Lattice Generated by a Unique Orbital Arrangement in the Copper Mineral KCu3As2O7(OH)3

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