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• W2894709883 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 $S=1/2mathrm{C}{mathrm{u}}^{2+}$ 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 ${ensuremath{theta}}_{mathrm{CW}}=ensuremath{-}100phantom{rule{0.16em}{0ex}}mathrm{K}$, antiferromagnetic transition occurred at ${T}_{N}=11phantom{rule{0.16em}{0ex}}mathrm{K}$, followed by an uprising turn of the magnetic susceptibility below ensuremath{sim}7 K. Neutron-diffraction experiment revealed a coplanar spin structure on the triangular lattice below the ${T}_{N}$, 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 ${120}^{ensuremath{circ}}$ 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 ${T}^{*}ensuremath{sim}5phantom{rule{0.16em}{0ex}}mathrm{K}$, 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 $mathrm{LiNi}{mathrm{O}}_{2}$." @default.
• W2894709883 created "2018-10-12" @default.
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• W2894709883 date "2018-10-02" @default.
• W2894709883 modified "2023-09-26" @default.
• W2894709883 title "Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system" @default.
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• W2894709883 doi "https://doi.org/10.1103/physrevmaterials.2.104401" @default.
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