Low dimensional magnetism of M(VOPO4)2·4H2O layered compounds: the 2D ferromagnet Cd(VOPO4)2·4H2O and the 2D antiferromagnet Mg1–xZnx(VOPO4)2·4H2O with x≈0.28
Abstract
A magnetic study has been carried on the non-magnetic cations intercalated vanadyl phosphates Cd(VOPO
4
)
2
·4H
2
O and Mg
1–x
Zn
x
(VOPO
4
)
2
·4H
2
O with x≈0.28. The susceptibility measurements are indicative of weak magnetic interactions within the negatively charged [VO
4/2
OPO
4/2
]
∞
–
layers, which are interpreted on the basis of a 2D square planar Heisenberg model. Cd(VOPO
4
)
2
·4H
2
O is ferromagnetic with J=+0.87 cm
–1
while Mg
0.72
Zn
0.28
(VOPO
4
)
2
·4H
2
O is antiferromagnetic (J=–1.93 cm
–1
). The obtained results are discussed in connexion with the structural features.
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