抄録
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.
| 元の言語 | 英語 |
|---|---|
| 記事番号 | 104401 |
| ジャーナル | Physical Review Materials |
| 巻 | 2 |
| 発行部数 | 10 |
| DOI | |
| 出版物ステータス | 出版済み - 10 2 2018 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy (miscellaneous)
これを引用
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.
：: Physical Review Materials, 巻 2, 番号 10, 104401, 02.10.2018.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Two-dimensional triangular-lattice Cu(OH)Cl, belloite, as a magnetodielectric system
AU - Zheng, Xu Guang
AU - Yamauchi, Ichihiro
AU - Kitajima, Shigeto
AU - Fujihala, Masayoshi
AU - Maki, M.
AU - Lee, Sanghyun
AU - Hagihala, Masato
AU - Torii, S.
AU - Kamiyama, T.
AU - Kawae, Tatsuya
PY - 2018/10/2
Y1 - 2018/10/2
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevMaterials.2.104401
DO - 10.1103/PhysRevMaterials.2.104401
M3 - Article
AN - SCOPUS:85059856692
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 10
M1 - 104401
ER -