Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system

Xu Guang Zheng, Ichihiro Yamauchi, Shigeto Kitajima, Masayoshi Fujihala, M. Maki, Sanghyun Lee, Masato Hagihala, S. Torii, T. Kamiyama, Tatsuya Kawae

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Abstract

Quantum spins on a triangular lattice may bring out intriguing and exotic quantum ground states. Here we report a magnetodielectric system of CuOHCl wherein S=1/2Cu2+ spins constitute a two-dimensional triangular lattice with the layers weakly coupled via Cl-H-O bonding. Despite strong magnetic interactions, as expected from the relatively high value of θCW=-100K, antiferromagnetic transition occurred at TN=11K, followed by an uprising turn of the magnetic susceptibility below ∼7 K. Neutron-diffraction experiment revealed a coplanar spin structure on the triangular lattice below the TN, with each spin pointing toward the center of a triangle. Of the three spins on a triangle, two are antiparallel and the third one is angled 120 to the antiparallel spins. A concerted effect of geometric frustration in the triangular lattice and superexchange interactions through a zig-zag path via double Cu-O-Cu and double Cu-Cl-Cu bridges counted for this spin arrangement. Further investigation using dielectric constant and heat capacity measurements, as well as a microscopic probe of muon spin rotation, revealed a magnetodielectric effect and the possibility of multiferroic transition at T∗∼5K, which is suspected to be in close relation to geometric frustration in this triangular lattice. The present paper presents a magnetodielectric system on a two-dimensional triangular lattice with chemical stoichiometry. It can also serve as a rare reference to the hotly debated quantum spin-orbital liquid compound LiNiO2.

Original languageEnglish
Article number104401
JournalPhysical Review Materials
Volume2
Issue number10
DOIs
Publication statusPublished - Oct 2 2018

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Neutron diffraction
Magnetic susceptibility
Crystal lattices
Stoichiometry
Ground state
Specific heat
Permittivity
Liquids
frustration
triangles
Experiments
muon spin rotation
neutron diffraction
stoichiometry
specific heat
interactions
permittivity
magnetic permeability
orbitals
ground state

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system. / Zheng, Xu Guang; Yamauchi, Ichihiro; Kitajima, Shigeto; Fujihala, Masayoshi; Maki, M.; Lee, Sanghyun; Hagihala, Masato; Torii, S.; Kamiyama, T.; Kawae, Tatsuya.

In: Physical Review Materials, Vol. 2, No. 10, 104401, 02.10.2018.

Research output: Contribution to journalArticle

Zheng, XG, Yamauchi, I, Kitajima, S, Fujihala, M, Maki, M, Lee, S, Hagihala, M, Torii, S, Kamiyama, T & Kawae, T 2018, 'Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system', Physical Review Materials, vol. 2, no. 10, 104401. https://doi.org/10.1103/PhysRevMaterials.2.104401
Zheng, Xu Guang ; Yamauchi, Ichihiro ; Kitajima, Shigeto ; Fujihala, Masayoshi ; Maki, M. ; Lee, Sanghyun ; Hagihala, Masato ; Torii, S. ; Kamiyama, T. ; Kawae, Tatsuya. / Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system. In: Physical Review Materials. 2018 ; Vol. 2, No. 10.
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