Crystal and Magnetic Structure of Two New Frustrated quantum Magnets

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Frustration in Heisenberg spin systems originates from antiferromagnetic networks of triangles or tetrahedra. Of the possible model systems, the 3-dimensional network of corner-shared triangles (known as the hyperkagome lattice) has not been explored experimentally despite predictions that it should give rise novel ground states. We have successfully synthesized powder samples of two new cuprates. The 1st, 2nd and 3rd neighbour interactions couple the Cu ions into isolated triangles, a hyperkagome lattice and uniform chains respectively....
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