Is there real materials have Lieb lattice structure? [closed]

Is there real materials have Lieb lattice structure?

Some examples?

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closed as not constructive by Sklivvz♦, Manishearth♦Jan 5 '13 at 20:23

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Please see the faq and How To Ask. Currently, this question is (a) make-a-list-y, and (b) shows no research effort, so I'm closing it. –  Manishearth Jan 5 '13 at 20:23

Plenty! The CuO$_2$ planes of cuprate superconductors are perhaps the most famous example, but in fact a lot of layered oxides are going to coordinate in this fashion. The Lieb lattice is essentially a two-dimensional counterpart of the "perovskite" structure, which is ubiquitous in nature.