The Pyrochlores and Spinels

Atom Wyckoff position Point symmetry Minimal coordinates 

The discussion will deal with three categories of magnetic pyrochlores, A-site only magnetic, B-site only magnetic and both A and B sites magnetic. 

Returning to the Gd case, reports from heat capacity experiments both in zero and applied magnetic fields, indicated a complex low temperature behaviour with at least two transitions in zero field, at 0.9 K and 0.6 Neutron diffraction data, taken on a GdiTiiOy sample 

With such a delicate zero field ground state, it is perhaps not surprising that application of even modest magnetic fields results in a complex phase diagram.f See Gardner and Gingras for more details. 

Tb2Ti20y is generally regarded as a robust example of a spin liquid. The major elements for this characterisation are the absence of evidence 

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