TY - JOUR
T1 -
Magnetic transitions in botallackite-structure Cu
2
(OH)
3
Br and Cu
2
(OH)
3
I
AU - Zheng, X. G.
AU - Yamashita, T.
AU - Hagihala, M.
AU - Fujihala, M.
AU - Kawae, Tatsuya
PY - 2009/4/15
Y1 - 2009/4/15
N2 -
The deformed pyrochlore lattice compound clinoatacamite, Cu
2
(OH)
3
Cl, shows intriguing frustrated magnetism and 1/4 substitution of Cu with nonmagnetic Zn leads to the two-dimensional kagome lattice ZnCu
3
Cl
2
(OH)
6
that exhibits spin liquid behaviour. These findings renewed interest in botallackite Cu
2
(OH)
3
Cl, which is a polymorphous structure of clinoatacamite Cu
2
(OH)
3
Cl possessing a two-dimensional triangular lattice. The present work investigates the effect of halogen ions on the magnetic transitions in the botallackite structure. Similar to the antiferromagnetic Cu
2
(OH)
3
Cl (T
N
=7.2 K), Cu
2
(OH)
3
Br and Cu
2
(OH)
3
I both showed antiferromagnetic transitions at T
N
=10 and 14 K, respectively. Long-range order also exists in Cu
2
(OH)
3
Br as exemplified by the μSR study. The experimental results suggest that the magnetic coupling on the triangular lattice is dominated by the super-exchange interaction through the halogen ions. Further detailed comparison studies on these botallackite-structure compounds are expected to clarify the spin configuration on this triangular lattice.
AB -
The deformed pyrochlore lattice compound clinoatacamite, Cu
2
(OH)
3
Cl, shows intriguing frustrated magnetism and 1/4 substitution of Cu with nonmagnetic Zn leads to the two-dimensional kagome lattice ZnCu
3
Cl
2
(OH)
6
that exhibits spin liquid behaviour. These findings renewed interest in botallackite Cu
2
(OH)
3
Cl, which is a polymorphous structure of clinoatacamite Cu
2
(OH)
3
Cl possessing a two-dimensional triangular lattice. The present work investigates the effect of halogen ions on the magnetic transitions in the botallackite structure. Similar to the antiferromagnetic Cu
2
(OH)
3
Cl (T
N
=7.2 K), Cu
2
(OH)
3
Br and Cu
2
(OH)
3
I both showed antiferromagnetic transitions at T
N
=10 and 14 K, respectively. Long-range order also exists in Cu
2
(OH)
3
Br as exemplified by the μSR study. The experimental results suggest that the magnetic coupling on the triangular lattice is dominated by the super-exchange interaction through the halogen ions. Further detailed comparison studies on these botallackite-structure compounds are expected to clarify the spin configuration on this triangular lattice.
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U2 - 10.1016/j.physb.2008.11.221
DO - 10.1016/j.physb.2008.11.221
M3 - Article
AN - SCOPUS:62949135636
SN - 0921-4526
VL - 404
SP - 680
EP - 682
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 5-7
ER -