Spangolite: an s = 1/2 maple leaf lattice antiferromagnet?

Spangolite, Cu(6)Al(SO(4))(OH)(12)Cl·3H(2)O, is a hydrated layered copper sulfate mineral. The Cu(2+) ions of each layer form a systematically depleted triangular lattice which approximates a maple leaf lattice. We present details of the crystal structure, which suggest that in spangolite this latti...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-04, Vol.23 (16), p.164201-6
Main Authors: Fennell, T, Piatek, J O, Stephenson, R A, Nilsen, G J, Rønnow, H M
Format: Article
Language:English
Subjects:
Condensed matter
COPPER SULFATE
Dimerization
Exchange
ION EXCHANGE
Ion exchangers
Lattices
LATTICES (CRYSTAL)
MAGNETIC PROPERTIES
MAGNETS
Sulfates
Trimers
Unit cell
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Summary:Spangolite, Cu(6)Al(SO(4))(OH)(12)Cl·3H(2)O, is a hydrated layered copper sulfate mineral. The Cu(2+) ions of each layer form a systematically depleted triangular lattice which approximates a maple leaf lattice. We present details of the crystal structure, which suggest that in spangolite this lattice actually comprises two species of edge linked trimers with different exchange parameters. However, magnetic susceptibility measurements show that despite the structural trimers, the magnetic properties are dominated by dimerization. The high temperature magnetic moment is strongly reduced below that expected for the six s = 1/2 in the unit cell.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/16/164201